Commit b279ddc3 authored by Vegard Nossum's avatar Vegard Nossum Committed by Linus Torvalds

mm: clarify mm_struct.mm_{users,count} documentation

Clarify documentation relating to mm_users and mm_count, and switch to
kernel-doc syntax.

Link: default avatarVegard Nossum <>
Acked-by: default avatarMichal Hocko <>
Acked-by: default avatarPeter Zijlstra (Intel) <>
Acked-by: default avatarDavid Rientjes <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 388f7934
......@@ -407,8 +407,27 @@ struct mm_struct {
unsigned long task_size; /* size of task vm space */
unsigned long highest_vm_end; /* highest vma end address */
pgd_t * pgd;
atomic_t mm_users; /* How many users with user space? */
atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
* @mm_users: The number of users including userspace.
* Use mmget()/mmget_not_zero()/mmput() to modify. When this drops
* to 0 (i.e. when the task exits and there are no other temporary
* reference holders), we also release a reference on @mm_count
* (which may then free the &struct mm_struct if @mm_count also
* drops to 0).
atomic_t mm_users;
* @mm_count: The number of references to &struct mm_struct
* (@mm_users count as 1).
* Use mmgrab()/mmdrop() to modify. When this drops to 0, the
* &struct mm_struct is freed.
atomic_t mm_count;
atomic_long_t nr_ptes; /* PTE page table pages */
atomic_long_t nr_pmds; /* PMD page table pages */
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