From 2ff2b7ec65dcea2261bdf404654975f44ad6323d Mon Sep 17 00:00:00 2001
From: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Mon, 19 Aug 2019 14:54:20 +0900
Subject: [PATCH] kbuild: add CONFIG_ASM_MODVERSIONS
Add CONFIG_ASM_MODVERSIONS. This allows to remove one if-conditional
nesting in scripts/Makefile.build.
scripts/Makefile.build is run every time Kbuild descends into a
sub-directory. So, I want to avoid $(wildcard ...) evaluation
where possible although computing $(wildcard ...) is so cheap that
it may not make measurable performance difference.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
arch/Kconfig | 7 +++++++
arch/alpha/Kconfig | 1 +
arch/arm64/Kconfig | 1 +
arch/ia64/Kconfig | 1 +
arch/m68k/Kconfig | 1 +
arch/mips/Kconfig | 1 +
arch/powerpc/Kconfig | 1 +
arch/riscv/Kconfig | 1 +
arch/s390/Kconfig | 1 +
arch/sparc/Kconfig | 1 +
arch/um/Kconfig | 1 +
arch/x86/Kconfig | 1 +
init/Kconfig | 8 ++++++++
scripts/Makefile.build | 7 +------
14 files changed, 27 insertions(+), 6 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index a7b57dd42c266..7d7b1b6af8516 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -289,6 +289,13 @@ config ARCH_32BIT_OFF_T
still support 32-bit off_t. This option is enabled for all such
architectures explicitly.
+config HAVE_ASM_MODVERSIONS
+ bool
+ help
+ This symbol should be selected by an architecure if it provides
+ <asm/asm-prototypes.h> to support the module versioning for symbols
+ exported from assembly code.
+
config HAVE_REGS_AND_STACK_ACCESS_API
bool
help
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index f7b19b813a701..ef179033a7c21 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -11,6 +11,7 @@ config ALPHA
select PCI_DOMAINS if PCI
select PCI_SYSCALL if PCI
select HAVE_AOUT
+ select HAVE_ASM_MODVERSIONS
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_PCSPKR_PLATFORM
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 3adcec05b1f67..cb16d4ade6aaf 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -135,6 +135,7 @@ config ARM64
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_ARCH_VMAP_STACK
select HAVE_ARM_SMCCC
+ select HAVE_ASM_MODVERSIONS
select HAVE_EBPF_JIT
select HAVE_C_RECORDMCOUNT
select HAVE_CMPXCHG_DOUBLE
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 7468d8e504672..3dead116a6d78 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -17,6 +17,7 @@ config IA64
select FORCE_PCI if (!IA64_HP_SIM)
select PCI_DOMAINS if PCI
select PCI_SYSCALL if PCI
+ select HAVE_ASM_MODVERSIONS
select HAVE_UNSTABLE_SCHED_CLOCK
select HAVE_EXIT_THREAD
select HAVE_IDE
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index c518d695c3760..00a20fa0bdcc2 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -14,6 +14,7 @@ config M68K
select DMA_DIRECT_REMAP if HAS_DMA && MMU && !COLDFIRE
select HAVE_IDE
select HAVE_AOUT if MMU
+ select HAVE_ASM_MODVERSIONS
select HAVE_DEBUG_BUGVERBOSE
select GENERIC_IRQ_SHOW
select GENERIC_ATOMIC64
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index d50fafd7bf3ae..3db919b5c93a4 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -44,6 +44,7 @@ config MIPS
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE if CPU_SUPPORTS_HUGEPAGES && 64BIT
+ select HAVE_ASM_MODVERSIONS
select HAVE_EBPF_JIT if (!CPU_MICROMIPS)
select HAVE_CONTEXT_TRACKING
select HAVE_COPY_THREAD_TLS
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 77f6ebf97113c..5be32ad8f47be 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -178,6 +178,7 @@ config PPC
select HAVE_ARCH_NVRAM_OPS
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
+ select HAVE_ASM_MODVERSIONS
select HAVE_C_RECORDMCOUNT
select HAVE_CBPF_JIT if !PPC64
select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 59a4727ecd6c0..66603f02675a7 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -31,6 +31,7 @@ config RISCV
select GENERIC_SMP_IDLE_THREAD
select GENERIC_ATOMIC64 if !64BIT
select HAVE_ARCH_AUDITSYSCALL
+ select HAVE_ASM_MODVERSIONS
select HAVE_MEMBLOCK_NODE_MAP
select HAVE_DMA_CONTIGUOUS
select HAVE_FUTEX_CMPXCHG if FUTEX
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index a4ad2733eedf6..c06ebe34e0f97 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -131,6 +131,7 @@ config S390
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_ARCH_VMAP_STACK
+ select HAVE_ASM_MODVERSIONS
select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
select HAVE_CMPXCHG_DOUBLE
select HAVE_CMPXCHG_LOCAL
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 7926a2e11bdc2..fbc1aecf0f94c 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -17,6 +17,7 @@ config SPARC
select ARCH_MIGHT_HAVE_PC_SERIO
select OF
select OF_PROMTREE
+ select HAVE_ASM_MODVERSIONS
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_ARCH_KGDB if !SMP || SPARC64
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 3c3adfc486f21..fec6b4ca2b6e5 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -9,6 +9,7 @@ config UML
select ARCH_NO_PREEMPT
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_SECCOMP_FILTER
+ select HAVE_ASM_MODVERSIONS
select HAVE_UID16
select HAVE_FUTEX_CMPXCHG if FUTEX
select HAVE_DEBUG_KMEMLEAK
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 222855cc01584..66bb9f25e9dff 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -147,6 +147,7 @@ config X86
select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
select HAVE_ARCH_VMAP_STACK if X86_64
select HAVE_ARCH_WITHIN_STACK_FRAMES
+ select HAVE_ASM_MODVERSIONS
select HAVE_CMPXCHG_DOUBLE
select HAVE_CMPXCHG_LOCAL
select HAVE_CONTEXT_TRACKING if X86_64
diff --git a/init/Kconfig b/init/Kconfig
index bd7d650d4a996..bf971b5c707de 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1989,6 +1989,14 @@ config MODVERSIONS
make them incompatible with the kernel you are running. If
unsure, say N.
+config ASM_MODVERSIONS
+ bool
+ default HAVE_ASM_MODVERSIONS && MODVERSIONS
+ help
+ This enables module versioning for exported symbols also from
+ assembly. This can be enabled only when the target architecture
+ supports it.
+
config MODULE_REL_CRCS
bool
depends on MODVERSIONS
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 10adf3b558de5..9fa09361aa5dd 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -349,11 +349,7 @@ $(obj)/%.s: $(src)/%.S FORCE
quiet_cmd_as_o_S = AS $(quiet_modtag) $@
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
-ifdef CONFIG_MODVERSIONS
-
-ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
-
-ifneq ($(ASM_PROTOTYPES),)
+ifdef CONFIG_ASM_MODVERSIONS
# versioning matches the C process described above, with difference that
# we parse asm-prototypes.h C header to get function definitions.
@@ -369,7 +365,6 @@ cmd_modversions_S = \
rm -f $(@D)/.tmp_$(@F:.o=.ver); \
fi
endif
-endif
$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
$(call if_changed_rule,as_o_S)
--
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