diff options
| author | Lorenzo Stoakes (Oracle) <ljs@kernel.org> | 2026-03-11 17:24:37 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-04-05 13:53:28 -0700 |
| commit | 2d1e54aab6fd01f7502af20e125312e06a15bf9c (patch) | |
| tree | ed7675c9ded1fe21974dcf65f93b27598435809b /include/linux | |
| parent | 9b9b8d4aebf1eb8fe22293dcfc38c600a7e7859b (diff) | |
mm: abstract reading sysctl_max_map_count, and READ_ONCE()
Concurrent reads and writes of sysctl_max_map_count are possible, so we
should READ_ONCE() and WRITE_ONCE().
The sysctl procfs logic already enforces WRITE_ONCE(), so abstract the
read side with get_sysctl_max_map_count().
While we're here, also move the field to mm/internal.h and add the getter
there since only mm interacts with it, there's no need for anybody else to
have access.
Finally, update the VMA userland tests to reflect the change.
Link: https://lkml.kernel.org/r/0715259eb37cbdfde4f9e5db92a20ec7110a1ce5.1773249037.git.ljs@kernel.org
Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Cc: Jann Horn <jannh@google.com>
Cc: Jianzhou Zhao <luckd0g@163.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mm.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index efb8be5d259c..25ba5816e02b 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -207,8 +207,6 @@ static inline void __mm_zero_struct_page(struct page *page) #define MAPCOUNT_ELF_CORE_MARGIN (5) #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) -extern int sysctl_max_map_count; - extern unsigned long sysctl_user_reserve_kbytes; extern unsigned long sysctl_admin_reserve_kbytes; |