diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index 1dca41bea16ad61fc8fe6f2be528ba452bffdf27..e73f6856962461952287b244831395200cdc3853 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -22,7 +22,7 @@
static inline pte_t huge_ptep_get(pte_t *ptep)
{
- return *ptep;
+ return READ_ONCE(*ptep);
}
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 9679067a15746ce921ba5a138c6508c0a4972d0a..7faed6e48b46212709485b7225c512f3fb99831e 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -185,42 +185,42 @@ static inline pmd_t kvm_s2pmd_mkexec(pmd_t pmd)
return pmd;
}
-static inline void kvm_set_s2pte_readonly(pte_t *pte)
+static inline void kvm_set_s2pte_readonly(pte_t *ptep)
{
pteval_t old_pteval, pteval;
- pteval = READ_ONCE(pte_val(*pte));
+ pteval = READ_ONCE(pte_val(*ptep));
do {
old_pteval = pteval;
pteval &= ~PTE_S2_RDWR;
pteval |= PTE_S2_RDONLY;
- pteval = cmpxchg_relaxed(&pte_val(*pte), old_pteval, pteval);
+ pteval = cmpxchg_relaxed(&pte_val(*ptep), old_pteval, pteval);
} while (pteval != old_pteval);
}
-static inline bool kvm_s2pte_readonly(pte_t *pte)
+static inline bool kvm_s2pte_readonly(pte_t *ptep)
{
- return (pte_val(*pte) & PTE_S2_RDWR) == PTE_S2_RDONLY;
+ return (READ_ONCE(pte_val(*ptep)) & PTE_S2_RDWR) == PTE_S2_RDONLY;
}
-static inline bool kvm_s2pte_exec(pte_t *pte)
+static inline bool kvm_s2pte_exec(pte_t *ptep)
{
- return !(pte_val(*pte) & PTE_S2_XN);
+ return !(READ_ONCE(pte_val(*ptep)) & PTE_S2_XN);
}
-static inline void kvm_set_s2pmd_readonly(pmd_t *pmd)
+static inline void kvm_set_s2pmd_readonly(pmd_t *pmdp)
{
- kvm_set_s2pte_readonly((pte_t *)pmd);
+ kvm_set_s2pte_readonly((pte_t *)pmdp);
}
-static inline bool kvm_s2pmd_readonly(pmd_t *pmd)
+static inline bool kvm_s2pmd_readonly(pmd_t *pmdp)
{
- return kvm_s2pte_readonly((pte_t *)pmd);
+ return kvm_s2pte_readonly((pte_t *)pmdp);
}
-static inline bool kvm_s2pmd_exec(pmd_t *pmd)
+static inline bool kvm_s2pmd_exec(pmd_t *pmdp)
{
- return !(pmd_val(*pmd) & PMD_S2_XN);
+ return !(READ_ONCE(pmd_val(*pmdp)) & PMD_S2_XN);
}
static inline bool kvm_page_empty(void *ptr)
diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
index 8d3331985d2e34b2099eab6cec8b456d40983052..39ec0b8a689eea3e495029685bed047737d64c5e 100644
--- a/arch/arm64/include/asm/mmu_context.h
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -141,13 +141,13 @@ static inline void cpu_install_idmap(void)
* Atomically replaces the active TTBR1_EL1 PGD with a new VA-compatible PGD,
* avoiding the possibility of conflicting TLB entries being allocated.
*/
-static inline void cpu_replace_ttbr1(pgd_t *pgd)
+static inline void cpu_replace_ttbr1(pgd_t *pgdp)
{
typedef void (ttbr_replace_func)(phys_addr_t);
extern ttbr_replace_func idmap_cpu_replace_ttbr1;
ttbr_replace_func *replace_phys;
- phys_addr_t pgd_phys = virt_to_phys(pgd);
+ phys_addr_t pgd_phys = virt_to_phys(pgdp);
replace_phys = (void *)__pa_symbol(idmap_cpu_replace_ttbr1);
diff --git a/arch/arm64/include/asm/pgalloc.h b/arch/arm64/include/asm/pgalloc.h
index e9d9f1b006efec5708fd0f33c006d2e017711a4d..2e05bcd944c8395b9fd5af993b6214054352aefc 100644
--- a/arch/arm64/include/asm/pgalloc.h
+++ b/arch/arm64/include/asm/pgalloc.h
@@ -36,23 +36,23 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
return (pmd_t *)__get_free_page(PGALLOC_GFP);
}
-static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
{
- BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
- free_page((unsigned long)pmd);
+ BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));
+ free_page((unsigned long)pmdp);
}
-static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot)
+static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
{
- set_pud(pud, __pud(__phys_to_pud_val(pmd) | prot));
+ set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
}
-static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
+static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
{
- __pud_populate(pud, __pa(pmd), PMD_TYPE_TABLE);
+ __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
}
#else
-static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot)
+static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
{
BUILD_BUG();
}
@@ -65,30 +65,30 @@ static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
return (pud_t *)__get_free_page(PGALLOC_GFP);
}
-static inline void pud_free(struct mm_struct *mm, pud_t *pud)
+static inline void pud_free(struct mm_struct *mm, pud_t *pudp)
{
- BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
- free_page((unsigned long)pud);
+ BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));
+ free_page((unsigned long)pudp);
}
-static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot)
+static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
{
- set_pgd(pgdp, __pgd(__phys_to_pgd_val(pud) | prot));
+ set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));
}
-static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
+static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp)
{
- __pgd_populate(pgd, __pa(pud), PUD_TYPE_TABLE);
+ __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);
}
#else
-static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot)
+static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
{
BUILD_BUG();
}
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
extern pgd_t *pgd_alloc(struct mm_struct *mm);
-extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
+extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
static inline pte_t *
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
@@ -114,10 +114,10 @@ pte_alloc_one(struct mm_struct *mm, unsigned long addr)
/*
* Free a PTE table.
*/
-static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *ptep)
{
- if (pte)
- free_page((unsigned long)pte);
+ if (ptep)
+ free_page((unsigned long)ptep);
}
static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
@@ -126,10 +126,10 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
__free_page(pte);
}
-static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
+static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
pmdval_t prot)
{
- set_pmd(pmdp, __pmd(__phys_to_pmd_val(pte) | prot));
+ set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
}
/*
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 094374c82db088816d6a35ec75e1658dfc446ec4..7e2c27e63cd894371655a569046faaa67cfc1837 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -218,7 +218,7 @@ static inline pmd_t pmd_mkcont(pmd_t pmd)
static inline void set_pte(pte_t *ptep, pte_t pte)
{
- *ptep = pte;
+ WRITE_ONCE(*ptep, pte);
/*
* Only if the new pte is valid and kernel, otherwise TLB maintenance
@@ -250,6 +250,8 @@ extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
+ pte_t old_pte;
+
if (pte_present(pte) && pte_user_exec(pte) && !pte_special(pte))
__sync_icache_dcache(pte, addr);
@@ -258,14 +260,15 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
* hardware updates of the pte (ptep_set_access_flags safely changes
* valid ptes without going through an invalid entry).
*/
- if (IS_ENABLED(CONFIG_DEBUG_VM) && pte_valid(*ptep) && pte_valid(pte) &&
+ old_pte = READ_ONCE(*ptep);
+ if (IS_ENABLED(CONFIG_DEBUG_VM) && pte_valid(old_pte) && pte_valid(pte) &&
(mm == current->active_mm || atomic_read(&mm->mm_users) > 1)) {
VM_WARN_ONCE(!pte_young(pte),
"%s: racy access flag clearing: 0x%016llx -> 0x%016llx",
- __func__, pte_val(*ptep), pte_val(pte));
- VM_WARN_ONCE(pte_write(*ptep) && !pte_dirty(pte),
+ __func__, pte_val(old_pte), pte_val(pte));
+ VM_WARN_ONCE(pte_write(old_pte) && !pte_dirty(pte),
"%s: racy dirty state clearing: 0x%016llx -> 0x%016llx",
- __func__, pte_val(*ptep), pte_val(pte));
+ __func__, pte_val(old_pte), pte_val(pte));
}
set_pte(ptep, pte);
@@ -431,7 +434,7 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
{
- *pmdp = pmd;
+ WRITE_ONCE(*pmdp, pmd);
dsb(ishst);
isb();
}
@@ -482,7 +485,7 @@ static inline phys_addr_t pmd_page_paddr(pmd_t pmd)
static inline void set_pud(pud_t *pudp, pud_t pud)
{
- *pudp = pud;
+ WRITE_ONCE(*pudp, pud);
dsb(ishst);
isb();
}
@@ -500,7 +503,7 @@ static inline phys_addr_t pud_page_paddr(pud_t pud)
/* Find an entry in the second-level page table. */
#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
-#define pmd_offset_phys(dir, addr) (pud_page_paddr(*(dir)) + pmd_index(addr) * sizeof(pmd_t))
+#define pmd_offset_phys(dir, addr) (pud_page_paddr(READ_ONCE(*(dir))) + pmd_index(addr) * sizeof(pmd_t))
#define pmd_offset(dir, addr) ((pmd_t *)__va(pmd_offset_phys((dir), (addr))))
#define pmd_set_fixmap(addr) ((pmd_t *)set_fixmap_offset(FIX_PMD, addr))
@@ -535,7 +538,7 @@ static inline phys_addr_t pud_page_paddr(pud_t pud)
static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
{
- *pgdp = pgd;
+ WRITE_ONCE(*pgdp, pgd);
dsb(ishst);
}
@@ -552,7 +555,7 @@ static inline phys_addr_t pgd_page_paddr(pgd_t pgd)
/* Find an entry in the frst-level page table. */
#define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
-#define pud_offset_phys(dir, addr) (pgd_page_paddr(*(dir)) + pud_index(addr) * sizeof(pud_t))
+#define pud_offset_phys(dir, addr) (pgd_page_paddr(READ_ONCE(*(dir))) + pud_index(addr) * sizeof(pud_t))
#define pud_offset(dir, addr) ((pud_t *)__va(pud_offset_phys((dir), (addr))))
#define pud_set_fixmap(addr) ((pud_t *)set_fixmap_offset(FIX_PUD, addr))
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index f85ac58d08a35676f38fa2a6d7b0887fb6f1d2ec..a8bf1c892b9065ca40ed4b263317deced2b8d693 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -90,7 +90,7 @@ static int __init set_permissions(pte_t *ptep, pgtable_t token,
unsigned long addr, void *data)
{
efi_memory_desc_t *md = data;
- pte_t pte = *ptep;
+ pte_t pte = READ_ONCE(*ptep);
if (md->attribute & EFI_MEMORY_RO)
pte = set_pte_bit(pte, __pgprot(PTE_RDONLY));
diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index f20cf7e992495adffcd2049c4c40f9ec6798c99f..1ec5f28c39fc56c4aae85cc5801bd513cc3ea2c3 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -202,10 +202,10 @@ static int create_safe_exec_page(void *src_start, size_t length,
gfp_t mask)
{
int rc = 0;
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
+ pgd_t *pgdp;
+ pud_t *pudp;
+ pmd_t *pmdp;
+ pte_t *ptep;
unsigned long dst = (unsigned long)allocator(mask);
if (!dst) {
@@ -216,38 +216,38 @@ static int create_safe_exec_page(void *src_start, size_t length,
memcpy((void *)dst, src_start, length);
flush_icache_range(dst, dst + length);
- pgd = pgd_offset_raw(allocator(mask), dst_addr);
- if (pgd_none(*pgd)) {
- pud = allocator(mask);
- if (!pud) {
+ pgdp = pgd_offset_raw(allocator(mask), dst_addr);
+ if (pgd_none(READ_ONCE(*pgdp))) {
+ pudp = allocator(mask);
+ if (!pudp) {
rc = -ENOMEM;
goto out;
}
- pgd_populate(&init_mm, pgd, pud);
+ pgd_populate(&init_mm, pgdp, pudp);
}
- pud = pud_offset(pgd, dst_addr);
- if (pud_none(*pud)) {
- pmd = allocator(mask);
- if (!pmd) {
+ pudp = pud_offset(pgdp, dst_addr);
+ if (pud_none(READ_ONCE(*pudp))) {
+ pmdp = allocator(mask);
+ if (!pmdp) {
rc = -ENOMEM;
goto out;
}
- pud_populate(&init_mm, pud, pmd);
+ pud_populate(&init_mm, pudp, pmdp);
}
- pmd = pmd_offset(pud, dst_addr);
- if (pmd_none(*pmd)) {
- pte = allocator(mask);
- if (!pte) {
+ pmdp = pmd_offset(pudp, dst_addr);
+ if (pmd_none(READ_ONCE(*pmdp))) {
+ ptep = allocator(mask);
+ if (!ptep) {
rc = -ENOMEM;
goto out;
}
- pmd_populate_kernel(&init_mm, pmd, pte);
+ pmd_populate_kernel(&init_mm, pmdp, ptep);
}
- pte = pte_offset_kernel(pmd, dst_addr);
- set_pte(pte, pfn_pte(virt_to_pfn(dst), PAGE_KERNEL_EXEC));
+ ptep = pte_offset_kernel(pmdp, dst_addr);
+ set_pte(ptep, pfn_pte(virt_to_pfn(dst), PAGE_KERNEL_EXEC));
/*
* Load our new page tables. A strict BBM approach requires that we
@@ -263,7 +263,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
*/
cpu_set_reserved_ttbr0();
local_flush_tlb_all();
- write_sysreg(phys_to_ttbr(virt_to_phys(pgd)), ttbr0_el1);
+ write_sysreg(phys_to_ttbr(virt_to_phys(pgdp)), ttbr0_el1);
isb();
*phys_dst_addr = virt_to_phys((void *)dst);
@@ -320,9 +320,9 @@ int swsusp_arch_suspend(void)
return ret;
}
-static void _copy_pte(pte_t *dst_pte, pte_t *src_pte, unsigned long addr)
+static void _copy_pte(pte_t *dst_ptep, pte_t *src_ptep, unsigned long addr)
{
- pte_t pte = *src_pte;
+ pte_t pte = READ_ONCE(*src_ptep);
if (pte_valid(pte)) {
/*
@@ -330,7 +330,7 @@ static void _copy_pte(pte_t *dst_pte, pte_t *src_pte, unsigned long addr)
* read only (code, rodata). Clear the RDONLY bit from
* the temporary mappings we use during restore.
*/
- set_pte(dst_pte, pte_mkwrite(pte));
+ set_pte(dst_ptep, pte_mkwrite(pte));
} else if (debug_pagealloc_enabled() && !pte_none(pte)) {
/*
* debug_pagealloc will removed the PTE_VALID bit if
@@ -343,112 +343,116 @@ static void _copy_pte(pte_t *dst_pte, pte_t *src_pte, unsigned long addr)
*/
BUG_ON(!pfn_valid(pte_pfn(pte)));
- set_pte(dst_pte, pte_mkpresent(pte_mkwrite(pte)));
+ set_pte(dst_ptep, pte_mkpresent(pte_mkwrite(pte)));
}
}
-static int copy_pte(pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long start,
+static int copy_pte(pmd_t *dst_pmdp, pmd_t *src_pmdp, unsigned long start,
unsigned long end)
{
- pte_t *src_pte;
- pte_t *dst_pte;
+ pte_t *src_ptep;
+ pte_t *dst_ptep;
unsigned long addr = start;
- dst_pte = (pte_t *)get_safe_page(GFP_ATOMIC);
- if (!dst_pte)
+ dst_ptep = (pte_t *)get_safe_page(GFP_ATOMIC);
+ if (!dst_ptep)
return -ENOMEM;
- pmd_populate_kernel(&init_mm, dst_pmd, dst_pte);
- dst_pte = pte_offset_kernel(dst_pmd, start);
+ pmd_populate_kernel(&init_mm, dst_pmdp, dst_ptep);
+ dst_ptep = pte_offset_kernel(dst_pmdp, start);
- src_pte = pte_offset_kernel(src_pmd, start);
+ src_ptep = pte_offset_kernel(src_pmdp, start);
do {
- _copy_pte(dst_pte, src_pte, addr);
- } while (dst_pte++, src_pte++, addr += PAGE_SIZE, addr != end);
+ _copy_pte(dst_ptep, src_ptep, addr);
+ } while (dst_ptep++, src_ptep++, addr += PAGE_SIZE, addr != end);
return 0;
}
-static int copy_pmd(pud_t *dst_pud, pud_t *src_pud, unsigned long start,
+static int copy_pmd(pud_t *dst_pudp, pud_t *src_pudp, unsigned long start,
unsigned long end)
{
- pmd_t *src_pmd;
- pmd_t *dst_pmd;
+ pmd_t *src_pmdp;
+ pmd_t *dst_pmdp;
unsigned long next;
unsigned long addr = start;
- if (pud_none(*dst_pud)) {
- dst_pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
- if (!dst_pmd)
+ if (pud_none(READ_ONCE(*dst_pudp))) {
+ dst_pmdp = (pmd_t *)get_safe_page(GFP_ATOMIC);
+ if (!dst_pmdp)
return -ENOMEM;
- pud_populate(&init_mm, dst_pud, dst_pmd);
+ pud_populate(&init_mm, dst_pudp, dst_pmdp);
}
- dst_pmd = pmd_offset(dst_pud, start);
+ dst_pmdp = pmd_offset(dst_pudp, start);
- src_pmd = pmd_offset(src_pud, start);
+ src_pmdp = pmd_offset(src_pudp, start);
do {
+ pmd_t pmd = READ_ONCE(*src_pmdp);
+
next = pmd_addr_end(addr, end);
- if (pmd_none(*src_pmd))
+ if (pmd_none(pmd))
continue;
- if (pmd_table(*src_pmd)) {
- if (copy_pte(dst_pmd, src_pmd, addr, next))
+ if (pmd_table(pmd)) {
+ if (copy_pte(dst_pmdp, src_pmdp, addr, next))
return -ENOMEM;
} else {
- set_pmd(dst_pmd,
- __pmd(pmd_val(*src_pmd) & ~PMD_SECT_RDONLY));
+ set_pmd(dst_pmdp,
+ __pmd(pmd_val(pmd) & ~PMD_SECT_RDONLY));
}
- } while (dst_pmd++, src_pmd++, addr = next, addr != end);
+ } while (dst_pmdp++, src_pmdp++, addr = next, addr != end);
return 0;
}
-static int copy_pud(pgd_t *dst_pgd, pgd_t *src_pgd, unsigned long start,
+static int copy_pud(pgd_t *dst_pgdp, pgd_t *src_pgdp, unsigned long start,
unsigned long end)
{
- pud_t *dst_pud;
- pud_t *src_pud;
+ pud_t *dst_pudp;
+ pud_t *src_pudp;
unsigned long next;
unsigned long addr = start;
- if (pgd_none(*dst_pgd)) {
- dst_pud = (pud_t *)get_safe_page(GFP_ATOMIC);
- if (!dst_pud)
+ if (pgd_none(READ_ONCE(*dst_pgdp))) {
+ dst_pudp = (pud_t *)get_safe_page(GFP_ATOMIC);
+ if (!dst_pudp)
return -ENOMEM;
- pgd_populate(&init_mm, dst_pgd, dst_pud);
+ pgd_populate(&init_mm, dst_pgdp, dst_pudp);
}
- dst_pud = pud_offset(dst_pgd, start);
+ dst_pudp = pud_offset(dst_pgdp, start);
- src_pud = pud_offset(src_pgd, start);
+ src_pudp = pud_offset(src_pgdp, start);
do {
+ pud_t pud = READ_ONCE(*src_pudp);
+
next = pud_addr_end(addr, end);
- if (pud_none(*src_pud))
+ if (pud_none(pud))
continue;
- if (pud_table(*(src_pud))) {
- if (copy_pmd(dst_pud, src_pud, addr, next))
+ if (pud_table(pud)) {
+ if (copy_pmd(dst_pudp, src_pudp, addr, next))
return -ENOMEM;
} else {
- set_pud(dst_pud,
- __pud(pud_val(*src_pud) & ~PMD_SECT_RDONLY));
+ set_pud(dst_pudp,
+ __pud(pud_val(pud) & ~PMD_SECT_RDONLY));
}
- } while (dst_pud++, src_pud++, addr = next, addr != end);
+ } while (dst_pudp++, src_pudp++, addr = next, addr != end);
return 0;
}
-static int copy_page_tables(pgd_t *dst_pgd, unsigned long start,
+static int copy_page_tables(pgd_t *dst_pgdp, unsigned long start,
unsigned long end)
{
unsigned long next;
unsigned long addr = start;
- pgd_t *src_pgd = pgd_offset_k(start);
+ pgd_t *src_pgdp = pgd_offset_k(start);
- dst_pgd = pgd_offset_raw(dst_pgd, start);
+ dst_pgdp = pgd_offset_raw(dst_pgdp, start);
do {
next = pgd_addr_end(addr, end);
- if (pgd_none(*src_pgd))
+ if (pgd_none(READ_ONCE(*src_pgdp)))
continue;
- if (copy_pud(dst_pgd, src_pgd, addr, next))
+ if (copy_pud(dst_pgdp, src_pgdp, addr, next))
return -ENOMEM;
- } while (dst_pgd++, src_pgd++, addr = next, addr != end);
+ } while (dst_pgdp++, src_pgdp++, addr = next, addr != end);
return 0;
}
diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index 7b60d62ac5939e83c8e153ec1c3a0447565f23eb..65dfc8571bf8397c3f2a6297d21b5112794461e1 100644
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -286,48 +286,52 @@ static void note_page(struct pg_state *st, unsigned long addr, unsigned level,
}
-static void walk_pte(struct pg_state *st, pmd_t *pmd, unsigned long start)
+static void walk_pte(struct pg_state *st, pmd_t *pmdp, unsigned long start)
{
- pte_t *pte = pte_offset_kernel(pmd, 0UL);
+ pte_t *ptep = pte_offset_kernel(pmdp, 0UL);
unsigned long addr;
unsigned i;
- for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
+ for (i = 0; i < PTRS_PER_PTE; i++, ptep++) {
addr = start + i * PAGE_SIZE;
- note_page(st, addr, 4, pte_val(*pte));
+ note_page(st, addr, 4, READ_ONCE(pte_val(*ptep)));
}
}
-static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
+static void walk_pmd(struct pg_state *st, pud_t *pudp, unsigned long start)
{
- pmd_t *pmd = pmd_offset(pud, 0UL);
+ pmd_t *pmdp = pmd_offset(pudp, 0UL);
unsigned long addr;
unsigned i;
- for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
+ for (i = 0; i < PTRS_PER_PMD; i++, pmdp++) {
+ pmd_t pmd = READ_ONCE(*pmdp);
+
addr = start + i * PMD_SIZE;
- if (pmd_none(*pmd) || pmd_sect(*pmd)) {
- note_page(st, addr, 3, pmd_val(*pmd));
+ if (pmd_none(pmd) || pmd_sect(pmd)) {
+ note_page(st, addr, 3, pmd_val(pmd));
} else {
- BUG_ON(pmd_bad(*pmd));
- walk_pte(st, pmd, addr);
+ BUG_ON(pmd_bad(pmd));
+ walk_pte(st, pmdp, addr);
}
}
}
-static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
+static void walk_pud(struct pg_state *st, pgd_t *pgdp, unsigned long start)
{
- pud_t *pud = pud_offset(pgd, 0UL);
+ pud_t *pudp = pud_offset(pgdp, 0UL);
unsigned long addr;
unsigned i;
- for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
+ for (i = 0; i < PTRS_PER_PUD; i++, pudp++) {
+ pud_t pud = READ_ONCE(*pudp);
+
addr = start + i * PUD_SIZE;
- if (pud_none(*pud) || pud_sect(*pud)) {
- note_page(st, addr, 2, pud_val(*pud));
+ if (pud_none(pud) || pud_sect(pud)) {
+ note_page(st, addr, 2, pud_val(pud));
} else {
- BUG_ON(pud_bad(*pud));
- walk_pmd(st, pud, addr);
+ BUG_ON(pud_bad(pud));
+ walk_pmd(st, pudp, addr);
}
}
}
@@ -335,17 +339,19 @@ static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
static void walk_pgd(struct pg_state *st, struct mm_struct *mm,
unsigned long start)
{
- pgd_t *pgd = pgd_offset(mm, 0UL);
+ pgd_t *pgdp = pgd_offset(mm, 0UL);
unsigned i;
unsigned long addr;
- for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
+ for (i = 0; i < PTRS_PER_PGD; i++, pgdp++) {
+ pgd_t pgd = READ_ONCE(*pgdp);
+
addr = start + i * PGDIR_SIZE;
- if (pgd_none(*pgd)) {
- note_page(st, addr, 1, pgd_val(*pgd));
+ if (pgd_none(pgd)) {
+ note_page(st, addr, 1, pgd_val(pgd));
} else {
- BUG_ON(pgd_bad(*pgd));
- walk_pud(st, pgd, addr);
+ BUG_ON(pgd_bad(pgd));
+ walk_pud(st, pgdp, addr);
}
}
}
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index f76bb2c3c9434dc29c572d4103f9eb10b42dc278..bff11553eb050306dfa9df7fec0682f6a03cbf61 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -130,7 +130,8 @@ static void mem_abort_decode(unsigned int esr)
void show_pte(unsigned long addr)
{
struct mm_struct *mm;
- pgd_t *pgd;
+ pgd_t *pgdp;
+ pgd_t pgd;
if (addr < TASK_SIZE) {
/* TTBR0 */
@@ -149,33 +150,37 @@ void show_pte(unsigned long addr)
return;
}
- pr_alert("%s pgtable: %luk pages, %u-bit VAs, pgd = %p\n",
+ pr_alert("%s pgtable: %luk pages, %u-bit VAs, pgdp = %p\n",
mm == &init_mm ? "swapper" : "user", PAGE_SIZE / SZ_1K,
VA_BITS, mm->pgd);
- pgd = pgd_offset(mm, addr);
- pr_alert("[%016lx] *pgd=%016llx", addr, pgd_val(*pgd));
+ pgdp = pgd_offset(mm, addr);
+ pgd = READ_ONCE(*pgdp);
+ pr_alert("[%016lx] pgd=%016llx", addr, pgd_val(pgd));
do {
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
+ pud_t *pudp, pud;
+ pmd_t *pmdp, pmd;
+ pte_t *ptep, pte;
- if (pgd_none(*pgd) || pgd_bad(*pgd))
+ if (pgd_none(pgd) || pgd_bad(pgd))
break;
- pud = pud_offset(pgd, addr);
- pr_cont(", *pud=%016llx", pud_val(*pud));
- if (pud_none(*pud) || pud_bad(*pud))
+ pudp = pud_offset(pgdp, addr);
+ pud = READ_ONCE(*pudp);
+ pr_cont(", pud=%016llx", pud_val(pud));
+ if (pud_none(pud) || pud_bad(pud))
break;
- pmd = pmd_offset(pud, addr);
- pr_cont(", *pmd=%016llx", pmd_val(*pmd));
- if (pmd_none(*pmd) || pmd_bad(*pmd))
+ pmdp = pmd_offset(pudp, addr);
+ pmd = READ_ONCE(*pmdp);
+ pr_cont(", pmd=%016llx", pmd_val(pmd));
+ if (pmd_none(pmd) || pmd_bad(pmd))
break;
- pte = pte_offset_map(pmd, addr);
- pr_cont(", *pte=%016llx", pte_val(*pte));
- pte_unmap(pte);
+ ptep = pte_offset_map(pmdp, addr);
+ pte = READ_ONCE(*ptep);
+ pr_cont(", pte=%016llx", pte_val(pte));
+ pte_unmap(ptep);
} while(0);
pr_cont("\n");
@@ -196,8 +201,9 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
pte_t entry, int dirty)
{
pteval_t old_pteval, pteval;
+ pte_t pte = READ_ONCE(*ptep);
- if (pte_same(*ptep, entry))
+ if (pte_same(pte, entry))
return 0;
/* only preserve the access flags and write permission */
@@ -210,7 +216,7 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
* (calculated as: a & b == ~(~a | ~b)).
*/
pte_val(entry) ^= PTE_RDONLY;
- pteval = READ_ONCE(pte_val(*ptep));
+ pteval = pte_val(pte);
do {
old_pteval = pteval;
pteval ^= PTE_RDONLY;
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 6cb0fa92a65162ecce1e84b8ef09177fcc54785d..ecc6818191df961eac49e6ca0c7d8b8d38d0c855 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -54,14 +54,14 @@ static inline pgprot_t pte_pgprot(pte_t pte)
static int find_num_contig(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, size_t *pgsize)
{
- pgd_t *pgd = pgd_offset(mm, addr);
- pud_t *pud;
- pmd_t *pmd;
+ pgd_t *pgdp = pgd_offset(mm, addr);
+ pud_t *pudp;
+ pmd_t *pmdp;
*pgsize = PAGE_SIZE;
- pud = pud_offset(pgd, addr);
- pmd = pmd_offset(pud, addr);
- if ((pte_t *)pmd == ptep) {
+ pudp = pud_offset(pgdp, addr);
+ pmdp = pmd_offset(pudp, addr);
+ if ((pte_t *)pmdp == ptep) {
*pgsize = PMD_SIZE;
return CONT_PMDS;
}
@@ -181,11 +181,8 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
clear_flush(mm, addr, ptep, pgsize, ncontig);
- for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn) {
- pr_debug("%s: set pte %p to 0x%llx\n", __func__, ptep,
- pte_val(pfn_pte(pfn, hugeprot)));
+ for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
- }
}
void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
@@ -203,20 +200,20 @@ void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *huge_pte_alloc(struct mm_struct *mm,
unsigned long addr, unsigned long sz)
{
- pgd_t *pgd;
- pud_t *pud;
- pte_t *pte = NULL;
-
- pr_debug("%s: addr:0x%lx sz:0x%lx\n", __func__, addr, sz);
- pgd = pgd_offset(mm, addr);
- pud = pud_alloc(mm, pgd, addr);
- if (!pud)
+ pgd_t *pgdp;
+ pud_t *pudp;
+ pmd_t *pmdp;
+ pte_t *ptep = NULL;
+
+ pgdp = pgd_offset(mm, addr);
+ pudp = pud_alloc(mm, pgdp, addr);
+ if (!pudp)
return NULL;
if (sz == PUD_SIZE) {
- pte = (pte_t *)pud;
+ ptep = (pte_t *)pudp;
} else if (sz == (PAGE_SIZE * CONT_PTES)) {
- pmd_t *pmd = pmd_alloc(mm, pud, addr);
+ pmdp = pmd_alloc(mm, pudp, addr);
WARN_ON(addr & (sz - 1));
/*
@@ -226,60 +223,55 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
* will be no pte_unmap() to correspond with this
* pte_alloc_map().
*/
- pte = pte_alloc_map(mm, pmd, addr);
+ ptep = pte_alloc_map(mm, pmdp, addr);
} else if (sz == PMD_SIZE) {
if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
- pud_none(*pud))
- pte = huge_pmd_share(mm, addr, pud);
+ pud_none(READ_ONCE(*pudp)))
+ ptep = huge_pmd_share(mm, addr, pudp);
else
- pte = (pte_t *)pmd_alloc(mm, pud, addr);
+ ptep = (pte_t *)pmd_alloc(mm, pudp, addr);
} else if (sz == (PMD_SIZE * CONT_PMDS)) {
- pmd_t *pmd;
-
- pmd = pmd_alloc(mm, pud, addr);
+ pmdp = pmd_alloc(mm, pudp, addr);
WARN_ON(addr & (sz - 1));
- return (pte_t *)pmd;
+ return (pte_t *)pmdp;
}
- pr_debug("%s: addr:0x%lx sz:0x%lx ret pte=%p/0x%llx\n", __func__, addr,
- sz, pte, pte_val(*pte));
- return pte;
+ return ptep;
}
pte_t *huge_pte_offset(struct mm_struct *mm,
unsigned long addr, unsigned long sz)
{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
+ pgd_t *pgdp;
+ pud_t *pudp, pud;
+ pmd_t *pmdp, pmd;
- pgd = pgd_offset(mm, addr);
- pr_debug("%s: addr:0x%lx pgd:%p\n", __func__, addr, pgd);
- if (!pgd_present(*pgd))
+ pgdp = pgd_offset(mm, addr);
+ if (!pgd_present(READ_ONCE(*pgdp)))
return NULL;
- pud = pud_offset(pgd, addr);
- if (sz != PUD_SIZE && pud_none(*pud))
+ pudp = pud_offset(pgdp, addr);
+ pud = READ_ONCE(*pudp);
+ if (sz != PUD_SIZE && pud_none(pud))
return NULL;
/* hugepage or swap? */
- if (pud_huge(*pud) || !pud_present(*pud))
- return (pte_t *)pud;
+ if (pud_huge(pud) || !pud_present(pud))
+ return (pte_t *)pudp;
/* table; check the next level */
if (sz == CONT_PMD_SIZE)
addr &= CONT_PMD_MASK;
- pmd = pmd_offset(pud, addr);
+ pmdp = pmd_offset(pudp, addr);
+ pmd = READ_ONCE(*pmdp);
if (!(sz == PMD_SIZE || sz == CONT_PMD_SIZE) &&
- pmd_none(*pmd))
+ pmd_none(pmd))
return NULL;
- if (pmd_huge(*pmd) || !pmd_present(*pmd))
- return (pte_t *)pmd;
+ if (pmd_huge(pmd) || !pmd_present(pmd))
+ return (pte_t *)pmdp;
- if (sz == CONT_PTE_SIZE) {
- pte_t *pte = pte_offset_kernel(pmd, (addr & CONT_PTE_MASK));
- return pte;
- }
+ if (sz == CONT_PTE_SIZE)
+ return pte_offset_kernel(pmdp, (addr & CONT_PTE_MASK));
return NULL;
}
@@ -367,7 +359,7 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm,
size_t pgsize;
pte_t pte;
- if (!pte_cont(*ptep)) {
+ if (!pte_cont(READ_ONCE(*ptep))) {
ptep_set_wrprotect(mm, addr, ptep);
return;
}
@@ -391,7 +383,7 @@ void huge_ptep_clear_flush(struct vm_area_struct *vma,
size_t pgsize;
int ncontig;
- if (!pte_cont(*ptep)) {
+ if (!pte_cont(READ_ONCE(*ptep))) {
ptep_clear_flush(vma, addr, ptep);
return;
}
diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index 6e02e6fb4c7b9e12da9796b2e8a2be68ca143ae0..dabfc1ecda3d3a9d57a430f1641eca05c1114703 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -44,92 +44,92 @@ static phys_addr_t __init kasan_alloc_zeroed_page(int node)
return __pa(p);
}
-static pte_t *__init kasan_pte_offset(pmd_t *pmd, unsigned long addr, int node,
+static pte_t *__init kasan_pte_offset(pmd_t *pmdp, unsigned long addr, int node,
bool early)
{
- if (pmd_none(*pmd)) {
+ if (pmd_none(READ_ONCE(*pmdp))) {
phys_addr_t pte_phys = early ? __pa_symbol(kasan_zero_pte)
: kasan_alloc_zeroed_page(node);
- __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE);
+ __pmd_populate(pmdp, pte_phys, PMD_TYPE_TABLE);
}
- return early ? pte_offset_kimg(pmd, addr)
- : pte_offset_kernel(pmd, addr);
+ return early ? pte_offset_kimg(pmdp, addr)
+ : pte_offset_kernel(pmdp, addr);
}
-static pmd_t *__init kasan_pmd_offset(pud_t *pud, unsigned long addr, int node,
+static pmd_t *__init kasan_pmd_offset(pud_t *pudp, unsigned long addr, int node,
bool early)
{
- if (pud_none(*pud)) {
+ if (pud_none(READ_ONCE(*pudp))) {
phys_addr_t pmd_phys = early ? __pa_symbol(kasan_zero_pmd)
: kasan_alloc_zeroed_page(node);
- __pud_populate(pud, pmd_phys, PMD_TYPE_TABLE);
+ __pud_populate(pudp, pmd_phys, PMD_TYPE_TABLE);
}
- return early ? pmd_offset_kimg(pud, addr) : pmd_offset(pud, addr);
+ return early ? pmd_offset_kimg(pudp, addr) : pmd_offset(pudp, addr);
}
-static pud_t *__init kasan_pud_offset(pgd_t *pgd, unsigned long addr, int node,
+static pud_t *__init kasan_pud_offset(pgd_t *pgdp, unsigned long addr, int node,
bool early)
{
- if (pgd_none(*pgd)) {
+ if (pgd_none(READ_ONCE(*pgdp))) {
phys_addr_t pud_phys = early ? __pa_symbol(kasan_zero_pud)
: kasan_alloc_zeroed_page(node);
- __pgd_populate(pgd, pud_phys, PMD_TYPE_TABLE);
+ __pgd_populate(pgdp, pud_phys, PMD_TYPE_TABLE);
}
- return early ? pud_offset_kimg(pgd, addr) : pud_offset(pgd, addr);
+ return early ? pud_offset_kimg(pgdp, addr) : pud_offset(pgdp, addr);
}
-static void __init kasan_pte_populate(pmd_t *pmd, unsigned long addr,
+static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr,
unsigned long end, int node, bool early)
{
unsigned long next;
- pte_t *pte = kasan_pte_offset(pmd, addr, node, early);
+ pte_t *ptep = kasan_pte_offset(pmdp, addr, node, early);
do {
phys_addr_t page_phys = early ? __pa_symbol(kasan_zero_page)
: kasan_alloc_zeroed_page(node);
next = addr + PAGE_SIZE;
- set_pte(pte, pfn_pte(__phys_to_pfn(page_phys), PAGE_KERNEL));
- } while (pte++, addr = next, addr != end && pte_none(*pte));
+ set_pte(ptep, pfn_pte(__phys_to_pfn(page_phys), PAGE_KERNEL));
+ } while (ptep++, addr = next, addr != end && pte_none(READ_ONCE(*ptep)));
}
-static void __init kasan_pmd_populate(pud_t *pud, unsigned long addr,
+static void __init kasan_pmd_populate(pud_t *pudp, unsigned long addr,
unsigned long end, int node, bool early)
{
unsigned long next;
- pmd_t *pmd = kasan_pmd_offset(pud, addr, node, early);
+ pmd_t *pmdp = kasan_pmd_offset(pudp, addr, node, early);
do {
next = pmd_addr_end(addr, end);
- kasan_pte_populate(pmd, addr, next, node, early);
- } while (pmd++, addr = next, addr != end && pmd_none(*pmd));
+ kasan_pte_populate(pmdp, addr, next, node, early);
+ } while (pmdp++, addr = next, addr != end && pmd_none(READ_ONCE(*pmdp)));
}
-static void __init kasan_pud_populate(pgd_t *pgd, unsigned long addr,
+static void __init kasan_pud_populate(pgd_t *pgdp, unsigned long addr,
unsigned long end, int node, bool early)
{
unsigned long next;
- pud_t *pud = kasan_pud_offset(pgd, addr, node, early);
+ pud_t *pudp = kasan_pud_offset(pgdp, addr, node, early);
do {
next = pud_addr_end(addr, end);
- kasan_pmd_populate(pud, addr, next, node, early);
- } while (pud++, addr = next, addr != end && pud_none(*pud));
+ kasan_pmd_populate(pudp, addr, next, node, early);
+ } while (pudp++, addr = next, addr != end && pud_none(READ_ONCE(*pudp)));
}
static void __init kasan_pgd_populate(unsigned long addr, unsigned long end,
int node, bool early)
{
unsigned long next;
- pgd_t *pgd;
+ pgd_t *pgdp;
- pgd = pgd_offset_k(addr);
+ pgdp = pgd_offset_k(addr);
do {
next = pgd_addr_end(addr, end);
- kasan_pud_populate(pgd, addr, next, node, early);
- } while (pgd++, addr = next, addr != end);
+ kasan_pud_populate(pgdp, addr, next, node, early);
+ } while (pgdp++, addr = next, addr != end);
}
/* The early shadow maps everything to a single page of zeroes */
@@ -155,14 +155,14 @@ static void __init kasan_map_populate(unsigned long start, unsigned long end,
*/
void __init kasan_copy_shadow(pgd_t *pgdir)
{
- pgd_t *pgd, *pgd_new, *pgd_end;
+ pgd_t *pgdp, *pgdp_new, *pgdp_end;
- pgd = pgd_offset_k(KASAN_SHADOW_START);
- pgd_end = pgd_offset_k(KASAN_SHADOW_END);
- pgd_new = pgd_offset_raw(pgdir, KASAN_SHADOW_START);
+ pgdp = pgd_offset_k(KASAN_SHADOW_START);
+ pgdp_end = pgd_offset_k(KASAN_SHADOW_END);
+ pgdp_new = pgd_offset_raw(pgdir, KASAN_SHADOW_START);
do {
- set_pgd(pgd_new, *pgd);
- } while (pgd++, pgd_new++, pgd != pgd_end);
+ set_pgd(pgdp_new, READ_ONCE(*pgdp));
+ } while (pgdp++, pgdp_new++, pgdp != pgdp_end);
}
static void __init clear_pgds(unsigned long start,
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 4694cda823c9541527b95f269658bdbc4b8243d7..3161b853f29e1d35a21b0da5a01f571c995616f3 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -125,45 +125,48 @@ static bool pgattr_change_is_safe(u64 old, u64 new)
return ((old ^ new) & ~mask) == 0;
}
-static void init_pte(pmd_t *pmd, unsigned long addr, unsigned long end,
+static void init_pte(pmd_t *pmdp, unsigned long addr, unsigned long end,
phys_addr_t phys, pgprot_t prot)
{
- pte_t *pte;
+ pte_t *ptep;
- pte = pte_set_fixmap_offset(pmd, addr);
+ ptep = pte_set_fixmap_offset(pmdp, addr);
do {
- pte_t old_pte = *pte;
+ pte_t old_pte = READ_ONCE(*ptep);
- set_pte(pte, pfn_pte(__phys_to_pfn(phys), prot));
+ set_pte(ptep, pfn_pte(__phys_to_pfn(phys), prot));
/*
* After the PTE entry has been populated once, we
* only allow updates to the permission attributes.
*/
- BUG_ON(!pgattr_change_is_safe(pte_val(old_pte), pte_val(*pte)));
+ BUG_ON(!pgattr_change_is_safe(pte_val(old_pte),
+ READ_ONCE(pte_val(*ptep))));
phys += PAGE_SIZE;
- } while (pte++, addr += PAGE_SIZE, addr != end);
+ } while (ptep++, addr += PAGE_SIZE, addr != end);
pte_clear_fixmap();
}
-static void alloc_init_cont_pte(pmd_t *pmd, unsigned long addr,
+static void alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
unsigned long end, phys_addr_t phys,
pgprot_t prot,
phys_addr_t (*pgtable_alloc)(void),
int flags)
{
unsigned long next;
+ pmd_t pmd = READ_ONCE(*pmdp);
- BUG_ON(pmd_sect(*pmd));
- if (pmd_none(*pmd)) {
+ BUG_ON(pmd_sect(pmd));
+ if (pmd_none(pmd)) {
phys_addr_t pte_phys;
BUG_ON(!pgtable_alloc);
pte_phys = pgtable_alloc();
- __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE);
+ __pmd_populate(pmdp, pte_phys, PMD_TYPE_TABLE);
+ pmd = READ_ONCE(*pmdp);
}
- BUG_ON(pmd_bad(*pmd));
+ BUG_ON(pmd_bad(pmd));
do {
pgprot_t __prot = prot;
@@ -175,67 +178,69 @@ static void alloc_init_cont_pte(pmd_t *pmd, unsigned long addr,
(flags & NO_CONT_MAPPINGS) == 0)
__prot = __pgprot(pgprot_val(prot) | PTE_CONT);
- init_pte(pmd, addr, next, phys, __prot);
+ init_pte(pmdp, addr, next, phys, __prot);
phys += next - addr;
} while (addr = next, addr != end);
}
-static void init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
+static void init_pmd(pud_t *pudp, unsigned long addr, unsigned long end,
phys_addr_t phys, pgprot_t prot,
phys_addr_t (*pgtable_alloc)(void), int flags)
{
unsigned long next;
- pmd_t *pmd;
+ pmd_t *pmdp;
- pmd = pmd_set_fixmap_offset(pud, addr);
+ pmdp = pmd_set_fixmap_offset(pudp, addr);
do {
- pmd_t old_pmd = *pmd;
+ pmd_t old_pmd = READ_ONCE(*pmdp);
next = pmd_addr_end(addr, end);
/* try section mapping first */
if (((addr | next | phys) & ~SECTION_MASK) == 0 &&
(flags & NO_BLOCK_MAPPINGS) == 0) {
- pmd_set_huge(pmd, phys, prot);
+ pmd_set_huge(pmdp, phys, prot);
/*
* After the PMD entry has been populated once, we
* only allow updates to the permission attributes.
*/
BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd),
- pmd_val(*pmd)));
+ READ_ONCE(pmd_val(*pmdp))));
} else {
- alloc_init_cont_pte(pmd, addr, next, phys, prot,
+ alloc_init_cont_pte(pmdp, addr, next, phys, prot,
pgtable_alloc, flags);
BUG_ON(pmd_val(old_pmd) != 0 &&
- pmd_val(old_pmd) != pmd_val(*pmd));
+ pmd_val(old_pmd) != READ_ONCE(pmd_val(*pmdp)));
}
phys += next - addr;
- } while (pmd++, addr = next, addr != end);
+ } while (pmdp++, addr = next, addr != end);
pmd_clear_fixmap();
}
-static void alloc_init_cont_pmd(pud_t *pud, unsigned long addr,
+static void alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
unsigned long end, phys_addr_t phys,
pgprot_t prot,
phys_addr_t (*pgtable_alloc)(void), int flags)
{
unsigned long next;
+ pud_t pud = READ_ONCE(*pudp);
/*
* Check for initial section mappings in the pgd/pud.
*/
- BUG_ON(pud_sect(*pud));
- if (pud_none(*pud)) {
+ BUG_ON(pud_sect(pud));
+ if (pud_none(pud)) {
phys_addr_t pmd_phys;
BUG_ON(!pgtable_alloc);
pmd_phys = pgtable_alloc();
- __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE);
+ __pud_populate(pudp, pmd_phys, PUD_TYPE_TABLE);
+ pud = READ_ONCE(*pudp);
}
- BUG_ON(pud_bad(*pud));
+ BUG_ON(pud_bad(pud));
do {
pgprot_t __prot = prot;
@@ -247,7 +252,7 @@ static void alloc_init_cont_pmd(pud_t *pud, unsigned long addr,
(flags & NO_CONT_MAPPINGS) == 0)
__prot = __pgprot(pgprot_val(prot) | PTE_CONT);
- init_pmd(pud, addr, next, phys, __prot, pgtable_alloc, flags);
+ init_pmd(pudp, addr, next, phys, __prot, pgtable_alloc, flags);
phys += next - addr;
} while (addr = next, addr != end);
@@ -265,25 +270,27 @@ static inline bool use_1G_block(unsigned long addr, unsigned long next,
return true;
}
-static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
- phys_addr_t phys, pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(void),
- int flags)
+static void alloc_init_pud(pgd_t *pgdp, unsigned long addr, unsigned long end,
+ phys_addr_t phys, pgprot_t prot,
+ phys_addr_t (*pgtable_alloc)(void),
+ int flags)
{
- pud_t *pud;
unsigned long next;
+ pud_t *pudp;
+ pgd_t pgd = READ_ONCE(*pgdp);
- if (pgd_none(*pgd)) {
+ if (pgd_none(pgd)) {
phys_addr_t pud_phys;
BUG_ON(!pgtable_alloc);
pud_phys = pgtable_alloc();
- __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE);
+ __pgd_populate(pgdp, pud_phys, PUD_TYPE_TABLE);
+ pgd = READ_ONCE(*pgdp);
}
- BUG_ON(pgd_bad(*pgd));
+ BUG_ON(pgd_bad(pgd));
- pud = pud_set_fixmap_offset(pgd, addr);
+ pudp = pud_set_fixmap_offset(pgdp, addr);
do {
- pud_t old_pud = *pud;
+ pud_t old_pud = READ_ONCE(*pudp);
next = pud_addr_end(addr, end);
@@ -292,23 +299,23 @@ static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
*/
if (use_1G_block(addr, next, phys) &&
(flags & NO_BLOCK_MAPPINGS) == 0) {
- pud_set_huge(pud, phys, prot);
+ pud_set_huge(pudp, phys, prot);
/*
* After the PUD entry has been populated once, we
* only allow updates to the permission attributes.
*/
BUG_ON(!pgattr_change_is_safe(pud_val(old_pud),
- pud_val(*pud)));
+ READ_ONCE(pud_val(*pudp))));
} else {
- alloc_init_cont_pmd(pud, addr, next, phys, prot,
+ alloc_init_cont_pmd(pudp, addr, next, phys, prot,
pgtable_alloc, flags);
BUG_ON(pud_val(old_pud) != 0 &&
- pud_val(old_pud) != pud_val(*pud));
+ pud_val(old_pud) != READ_ONCE(pud_val(*pudp)));
}
phys += next - addr;
- } while (pud++, addr = next, addr != end);
+ } while (pudp++, addr = next, addr != end);
pud_clear_fixmap();
}
@@ -320,7 +327,7 @@ static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
int flags)
{
unsigned long addr, length, end, next;
- pgd_t *pgd = pgd_offset_raw(pgdir, virt);
+ pgd_t *pgdp = pgd_offset_raw(pgdir, virt);
/*
* If the virtual and physical address don't have the same offset
@@ -336,10 +343,10 @@ static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
end = addr + length;
do {
next = pgd_addr_end(addr, end);
- alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc,
+ alloc_init_pud(pgdp, addr, next, phys, prot, pgtable_alloc,
flags);
phys += next - addr;
- } while (pgd++, addr = next, addr != end);
+ } while (pgdp++, addr = next, addr != end);
}
static phys_addr_t pgd_pgtable_alloc(void)
@@ -401,10 +408,10 @@ static void update_mapping_prot(phys_addr_t phys, unsigned long virt,
flush_tlb_kernel_range(virt, virt + size);
}
-static void __init __map_memblock(pgd_t *pgd, phys_addr_t start,
+static void __init __map_memblock(pgd_t *pgdp, phys_addr_t start,
phys_addr_t end, pgprot_t prot, int flags)
{
- __create_pgd_mapping(pgd, start, __phys_to_virt(start), end - start,
+ __create_pgd_mapping(pgdp, start, __phys_to_virt(start), end - start,
prot, early_pgtable_alloc, flags);
}
@@ -418,7 +425,7 @@ void __init mark_linear_text_alias_ro(void)
PAGE_KERNEL_RO);
}
-static void __init map_mem(pgd_t *pgd)
+static void __init map_mem(pgd_t *pgdp)
{
phys_addr_t kernel_start = __pa_symbol(_text);
phys_addr_t kernel_end = __pa_symbol(__init_begin);
@@ -451,7 +458,7 @@ static void __init map_mem(pgd_t *pgd)
if (memblock_is_nomap(reg))
continue;
- __map_memblock(pgd, start, end, PAGE_KERNEL, flags);
+ __map_memblock(pgdp, start, end, PAGE_KERNEL, flags);
}
/*
@@ -464,7 +471,7 @@ static void __init map_mem(pgd_t *pgd)
* Note that contiguous mappings cannot be remapped in this way,
* so we should avoid them here.
*/
- __map_memblock(pgd, kernel_start, kernel_end,
+ __map_memblock(pgdp, kernel_start, kernel_end,
PAGE_KERNEL, NO_CONT_MAPPINGS);
memblock_clear_nomap(kernel_start, kernel_end - kernel_start);
@@ -475,7 +482,7 @@ static void __init map_mem(pgd_t *pgd)
* through /sys/kernel/kexec_crash_size interface.
*/
if (crashk_res.end) {
- __map_memblock(pgd, crashk_res.start, crashk_res.end + 1,
+ __map_memblock(pgdp, crashk_res.start, crashk_res.end + 1,
PAGE_KERNEL,
NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS);
memblock_clear_nomap(crashk_res.start,
@@ -499,7 +506,7 @@ void mark_rodata_ro(void)
debug_checkwx();
}
-static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end,
+static void __init map_kernel_segment(pgd_t *pgdp, void *va_start, void *va_end,
pgprot_t prot, struct vm_struct *vma,
int flags, unsigned long vm_flags)
{
@@ -509,7 +516,7 @@ static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end,
BUG_ON(!PAGE_ALIGNED(pa_start));
BUG_ON(!PAGE_ALIGNED(size));
- __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot,
+ __create_pgd_mapping(pgdp, pa_start, (unsigned long)va_start, size, prot,
early_pgtable_alloc, flags);
if (!(vm_flags & VM_NO_GUARD))
@@ -562,7 +569,7 @@ core_initcall(map_entry_trampoline);
/*
* Create fine-grained mappings for the kernel.
*/
-static void __init map_kernel(pgd_t *pgd)
+static void __init map_kernel(pgd_t *pgdp)
{
static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_inittext,
vmlinux_initdata, vmlinux_data;
@@ -578,24 +585,24 @@ static void __init map_kernel(pgd_t *pgd)
* Only rodata will be remapped with different permissions later on,
* all other segments are allowed to use contiguous mappings.
*/
- map_kernel_segment(pgd, _text, _etext, text_prot, &vmlinux_text, 0,
+ map_kernel_segment(pgdp, _text, _etext, text_prot, &vmlinux_text, 0,
VM_NO_GUARD);
- map_kernel_segment(pgd, __start_rodata, __inittext_begin, PAGE_KERNEL,
+ map_kernel_segment(pgdp, __start_rodata, __inittext_begin, PAGE_KERNEL,
&vmlinux_rodata, NO_CONT_MAPPINGS, VM_NO_GUARD);
- map_kernel_segment(pgd, __inittext_begin, __inittext_end, text_prot,
+ map_kernel_segment(pgdp, __inittext_begin, __inittext_end, text_prot,
&vmlinux_inittext, 0, VM_NO_GUARD);
- map_kernel_segment(pgd, __initdata_begin, __initdata_end, PAGE_KERNEL,
+ map_kernel_segment(pgdp, __initdata_begin, __initdata_end, PAGE_KERNEL,
&vmlinux_initdata, 0, VM_NO_GUARD);
- map_kernel_segment(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data, 0, 0);
+ map_kernel_segment(pgdp, _data, _end, PAGE_KERNEL, &vmlinux_data, 0, 0);
- if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) {
+ if (!READ_ONCE(pgd_val(*pgd_offset_raw(pgdp, FIXADDR_START)))) {
/*
* The fixmap falls in a separate pgd to the kernel, and doesn't
* live in the carveout for the swapper_pg_dir. We can simply
* re-use the existing dir for the fixmap.
*/
- set_pgd(pgd_offset_raw(pgd, FIXADDR_START),
- *pgd_offset_k(FIXADDR_START));
+ set_pgd(pgd_offset_raw(pgdp, FIXADDR_START),
+ READ_ONCE(*pgd_offset_k(FIXADDR_START)));
} else if (CONFIG_PGTABLE_LEVELS > 3) {
/*
* The fixmap shares its top level pgd entry with the kernel
@@ -604,14 +611,15 @@ static void __init map_kernel(pgd_t *pgd)
* entry instead.
*/
BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
- pud_populate(&init_mm, pud_set_fixmap_offset(pgd, FIXADDR_START),
+ pud_populate(&init_mm,
+ pud_set_fixmap_offset(pgdp, FIXADDR_START),
lm_alias(bm_pmd));
pud_clear_fixmap();
} else {
BUG();
}
- kasan_copy_shadow(pgd);
+ kasan_copy_shadow(pgdp);
}
/*
@@ -621,10 +629,10 @@ static void __init map_kernel(pgd_t *pgd)
void __init paging_init(void)
{
phys_addr_t pgd_phys = early_pgtable_alloc();
- pgd_t *pgd = pgd_set_fixmap(pgd_phys);
+ pgd_t *pgdp = pgd_set_fixmap(pgd_phys);
- map_kernel(pgd);
- map_mem(pgd);
+ map_kernel(pgdp);
+ map_mem(pgdp);
/*
* We want to reuse the original swapper_pg_dir so we don't have to
@@ -635,7 +643,7 @@ void __init paging_init(void)
* To do this we need to go via a temporary pgd.
*/
cpu_replace_ttbr1(__va(pgd_phys));
- memcpy(swapper_pg_dir, pgd, PGD_SIZE);
+ memcpy(swapper_pg_dir, pgdp, PGD_SIZE);
cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
pgd_clear_fixmap();
@@ -655,37 +663,40 @@ void __init paging_init(void)
*/
int kern_addr_valid(unsigned long addr)
{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
+ pgd_t *pgdp;
+ pud_t *pudp, pud;
+ pmd_t *pmdp, pmd;
+ pte_t *ptep, pte;
if ((((long)addr) >> VA_BITS) != -1UL)
return 0;
- pgd = pgd_offset_k(addr);
- if (pgd_none(*pgd))
+ pgdp = pgd_offset_k(addr);
+ if (pgd_none(READ_ONCE(*pgdp)))
return 0;
- pud = pud_offset(pgd, addr);
- if (pud_none(*pud))
+ pudp = pud_offset(pgdp, addr);
+ pud = READ_ONCE(*pudp);
+ if (pud_none(pud))
return 0;
- if (pud_sect(*pud))
- return pfn_valid(pud_pfn(*pud));
+ if (pud_sect(pud))
+ return pfn_valid(pud_pfn(pud));
- pmd = pmd_offset(pud, addr);
- if (pmd_none(*pmd))
+ pmdp = pmd_offset(pudp, addr);
+ pmd = READ_ONCE(*pmdp);
+ if (pmd_none(pmd))
return 0;
- if (pmd_sect(*pmd))
- return pfn_valid(pmd_pfn(*pmd));
+ if (pmd_sect(pmd))
+ return pfn_valid(pmd_pfn(pmd));
- pte = pte_offset_kernel(pmd, addr);
- if (pte_none(*pte))
+ ptep = pte_offset_kernel(pmdp, addr);
+ pte = READ_ONCE(*ptep);
+ if (pte_none(pte))
return 0;
- return pfn_valid(pte_pfn(*pte));
+ return pfn_valid(pte_pfn(pte));
}
#ifdef CONFIG_SPARSEMEM_VMEMMAP
#if !ARM64_SWAPPER_USES_SECTION_MAPS
@@ -700,32 +711,32 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
{
unsigned long addr = start;
unsigned long next;
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
+ pgd_t *pgdp;
+ pud_t *pudp;
+ pmd_t *pmdp;
do {
next = pmd_addr_end(addr, end);
- pgd = vmemmap_pgd_populate(addr, node);
- if (!pgd)
+ pgdp = vmemmap_pgd_populate(addr, node);
+ if (!pgdp)
return -ENOMEM;
- pud = vmemmap_pud_populate(pgd, addr, node);
- if (!pud)
+ pudp = vmemmap_pud_populate(pgdp, addr, node);
+ if (!pudp)
return -ENOMEM;
- pmd = pmd_offset(pud, addr);
- if (pmd_none(*pmd)) {
+ pmdp = pmd_offset(pudp, addr);
+ if (pmd_none(READ_ONCE(*pmdp))) {
void *p = NULL;
p = vmemmap_alloc_block_buf(PMD_SIZE, node);
if (!p)
return -ENOMEM;
- pmd_set_huge(pmd, __pa(p), __pgprot(PROT_SECT_NORMAL));
+ pmd_set_huge(pmdp, __pa(p), __pgprot(PROT_SECT_NORMAL));
} else
- vmemmap_verify((pte_t *)pmd, node, addr, next);
+ vmemmap_verify((pte_t *)pmdp, node, addr, next);
} while (addr = next, addr != end);
return 0;
@@ -739,20 +750,22 @@ void vmemmap_free(unsigned long start, unsigned long end,
static inline pud_t * fixmap_pud(unsigned long addr)
{
- pgd_t *pgd = pgd_offset_k(addr);
+ pgd_t *pgdp = pgd_offset_k(addr);
+ pgd_t pgd = READ_ONCE(*pgdp);
- BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd));
+ BUG_ON(pgd_none(pgd) || pgd_bad(pgd));
- return pud_offset_kimg(pgd, addr);
+ return pud_offset_kimg(pgdp, addr);
}
static inline pmd_t * fixmap_pmd(unsigned long addr)
{
- pud_t *pud = fixmap_pud(addr);
+ pud_t *pudp = fixmap_pud(addr);
+ pud_t pud = READ_ONCE(*pudp);
- BUG_ON(pud_none(*pud) || pud_bad(*pud));
+ BUG_ON(pud_none(pud) || pud_bad(pud));
- return pmd_offset_kimg(pud, addr);
+ return pmd_offset_kimg(pudp, addr);
}
static inline pte_t * fixmap_pte(unsigned long addr)
@@ -768,30 +781,31 @@ static inline pte_t * fixmap_pte(unsigned long addr)
*/
void __init early_fixmap_init(void)
{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
+ pgd_t *pgdp, pgd;
+ pud_t *pudp;
+ pmd_t *pmdp;
unsigned long addr = FIXADDR_START;
- pgd = pgd_offset_k(addr);
+ pgdp = pgd_offset_k(addr);
+ pgd = READ_ONCE(*pgdp);
if (CONFIG_PGTABLE_LEVELS > 3 &&
- !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa_symbol(bm_pud))) {
+ !(pgd_none(pgd) || pgd_page_paddr(pgd) == __pa_symbol(bm_pud))) {
/*
* We only end up here if the kernel mapping and the fixmap
* share the top level pgd entry, which should only happen on
* 16k/4 levels configurations.
*/
BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
- pud = pud_offset_kimg(pgd, addr);
+ pudp = pud_offset_kimg(pgdp, addr);
} else {
- if (pgd_none(*pgd))
- __pgd_populate(pgd, __pa_symbol(bm_pud), PUD_TYPE_TABLE);
- pud = fixmap_pud(addr);
+ if (pgd_none(pgd))
+ __pgd_populate(pgdp, __pa_symbol(bm_pud), PUD_TYPE_TABLE);
+ pudp = fixmap_pud(addr);
}
- if (pud_none(*pud))
- __pud_populate(pud, __pa_symbol(bm_pmd), PMD_TYPE_TABLE);
- pmd = fixmap_pmd(addr);
- __pmd_populate(pmd, __pa_symbol(bm_pte), PMD_TYPE_TABLE);
+ if (pud_none(READ_ONCE(*pudp)))
+ __pud_populate(pudp, __pa_symbol(bm_pmd), PMD_TYPE_TABLE);
+ pmdp = fixmap_pmd(addr);
+ __pmd_populate(pmdp, __pa_symbol(bm_pte), PMD_TYPE_TABLE);
/*
* The boot-ioremap range spans multiple pmds, for which
@@ -800,11 +814,11 @@ void __init early_fixmap_init(void)
BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
!= (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
- if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)))
- || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) {
+ if ((pmdp != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)))
+ || pmdp != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) {
WARN_ON(1);
- pr_warn("pmd %p != %p, %p\n",
- pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)),
+ pr_warn("pmdp %p != %p, %p\n",
+ pmdp, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)),
fixmap_pmd(fix_to_virt(FIX_BTMAP_END)));
pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
fix_to_virt(FIX_BTMAP_BEGIN));
@@ -824,16 +838,16 @@ void __set_fixmap(enum fixed_addresses idx,
phys_addr_t phys, pgprot_t flags)
{
unsigned long addr = __fix_to_virt(idx);
- pte_t *pte;
+ pte_t *ptep;
BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
- pte = fixmap_pte(addr);
+ ptep = fixmap_pte(addr);
if (pgprot_val(flags)) {
- set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
+ set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags));
} else {
- pte_clear(&init_mm, addr, pte);
+ pte_clear(&init_mm, addr, ptep);
flush_tlb_kernel_range(addr, addr+PAGE_SIZE);
}
}
@@ -915,36 +929,36 @@ int __init arch_ioremap_pmd_supported(void)
return 1;
}
-int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)
+int pud_set_huge(pud_t *pudp, phys_addr_t phys, pgprot_t prot)
{
pgprot_t sect_prot = __pgprot(PUD_TYPE_SECT |
pgprot_val(mk_sect_prot(prot)));
BUG_ON(phys & ~PUD_MASK);
- set_pud(pud, pfn_pud(__phys_to_pfn(phys), sect_prot));
+ set_pud(pudp, pfn_pud(__phys_to_pfn(phys), sect_prot));
return 1;
}
-int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot)
+int pmd_set_huge(pmd_t *pmdp, phys_addr_t phys, pgprot_t prot)
{
pgprot_t sect_prot = __pgprot(PMD_TYPE_SECT |
pgprot_val(mk_sect_prot(prot)));
BUG_ON(phys & ~PMD_MASK);
- set_pmd(pmd, pfn_pmd(__phys_to_pfn(phys), sect_prot));
+ set_pmd(pmdp, pfn_pmd(__phys_to_pfn(phys), sect_prot));
return 1;
}
-int pud_clear_huge(pud_t *pud)
+int pud_clear_huge(pud_t *pudp)
{
- if (!pud_sect(*pud))
+ if (!pud_sect(READ_ONCE(*pudp)))
return 0;
- pud_clear(pud);
+ pud_clear(pudp);
return 1;
}
-int pmd_clear_huge(pmd_t *pmd)
+int pmd_clear_huge(pmd_t *pmdp)
{
- if (!pmd_sect(*pmd))
+ if (!pmd_sect(READ_ONCE(*pmdp)))
return 0;
- pmd_clear(pmd);
+ pmd_clear(pmdp);
return 1;
}
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c
index a682a0a2a0fa4d5db9175256e78100b1afde344a..a56359373d8b3592e6cde6891d9b44206bd96137 100644
--- a/arch/arm64/mm/pageattr.c
+++ b/arch/arm64/mm/pageattr.c
@@ -29,7 +29,7 @@ static int change_page_range(pte_t *ptep, pgtable_t token, unsigned long addr,
void *data)
{
struct page_change_data *cdata = data;
- pte_t pte = *ptep;
+ pte_t pte = READ_ONCE(*ptep);
pte = clear_pte_bit(pte, cdata->clear_mask);
pte = set_pte_bit(pte, cdata->set_mask);
@@ -156,30 +156,32 @@ void __kernel_map_pages(struct page *page, int numpages, int enable)
*/
bool kernel_page_present(struct page *page)
{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
+ pgd_t *pgdp;
+ pud_t *pudp, pud;
+ pmd_t *pmdp, pmd;
+ pte_t *ptep;
unsigned long addr = (unsigned long)page_address(page);
- pgd = pgd_offset_k(addr);
- if (pgd_none(*pgd))
+ pgdp = pgd_offset_k(addr);
+ if (pgd_none(READ_ONCE(*pgdp)))
return false;
- pud = pud_offset(pgd, addr);
- if (pud_none(*pud))
+ pudp = pud_offset(pgdp, addr);
+ pud = READ_ONCE(*pudp);
+ if (pud_none(pud))
return false;
- if (pud_sect(*pud))
+ if (pud_sect(pud))
return true;
- pmd = pmd_offset(pud, addr);
- if (pmd_none(*pmd))
+ pmdp = pmd_offset(pudp, addr);
+ pmd = READ_ONCE(*pmdp);
+ if (pmd_none(pmd))
return false;
- if (pmd_sect(*pmd))
+ if (pmd_sect(pmd))
return true;
- pte = pte_offset_kernel(pmd, addr);
- return pte_valid(*pte);
+ ptep = pte_offset_kernel(pmdp, addr);
+ return pte_valid(READ_ONCE(*ptep));
}
#endif /* CONFIG_HIBERNATION */
#endif /* CONFIG_DEBUG_PAGEALLOC */