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| author | Vegard Nossum <vegard.nossum@oracle.com> | 2017-02-27 14:30:10 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-27 18:43:48 -0800 |
| commit | 3fce371bfac2be0396ffc1e763600e6c6b1bb52a (patch) | |
| tree | da45267ba334ada341aa13d600848299564751ce /mm | |
| parent | f1f1007644ffc8051a4c11427d58b1967ae7b75a (diff) | |
| download | lwn-3fce371bfac2be0396ffc1e763600e6c6b1bb52a.tar.gz lwn-3fce371bfac2be0396ffc1e763600e6c6b1bb52a.zip | |
mm: add new mmget() helper
Apart from adding the helper function itself, the rest of the kernel is
converted mechanically using:
git grep -l 'atomic_inc.*mm_users' | xargs sed -i 's/atomic_inc(&\(.*\)->mm_users);/mmget\(\1\);/'
git grep -l 'atomic_inc.*mm_users' | xargs sed -i 's/atomic_inc(&\(.*\)\.mm_users);/mmget\(\&\1\);/'
This is needed for a later patch that hooks into the helper, but might
be a worthwhile cleanup on its own.
(Michal Hocko provided most of the kerneldoc comment.)
Link: http://lkml.kernel.org/r/20161218123229.22952-2-vegard.nossum@oracle.com
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/swapfile.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 2cac12cc9abe..7a0713b76668 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1671,7 +1671,7 @@ int try_to_unuse(unsigned int type, bool frontswap, * that. */ start_mm = &init_mm; - atomic_inc(&init_mm.mm_users); + mmget(&init_mm); /* * Keep on scanning until all entries have gone. Usually, @@ -1720,7 +1720,7 @@ int try_to_unuse(unsigned int type, bool frontswap, if (atomic_read(&start_mm->mm_users) == 1) { mmput(start_mm); start_mm = &init_mm; - atomic_inc(&init_mm.mm_users); + mmget(&init_mm); } /* @@ -1757,8 +1757,8 @@ int try_to_unuse(unsigned int type, bool frontswap, struct mm_struct *prev_mm = start_mm; struct mm_struct *mm; - atomic_inc(&new_start_mm->mm_users); - atomic_inc(&prev_mm->mm_users); + mmget(new_start_mm); + mmget(prev_mm); spin_lock(&mmlist_lock); while (swap_count(*swap_map) && !retval && (p = p->next) != &start_mm->mmlist) { @@ -1781,7 +1781,7 @@ int try_to_unuse(unsigned int type, bool frontswap, if (set_start_mm && *swap_map < swcount) { mmput(new_start_mm); - atomic_inc(&mm->mm_users); + mmget(mm); new_start_mm = mm; set_start_mm = 0; } |