From 3fce371bfac2be0396ffc1e763600e6c6b1bb52a Mon Sep 17 00:00:00 2001 From: Vegard Nossum Date: Mon, 27 Feb 2017 14:30:10 -0800 Subject: 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 Acked-by: Michal Hocko Acked-by: Peter Zijlstra (Intel) Acked-by: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/fork.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'kernel') diff --git a/kernel/fork.c b/kernel/fork.c index 348fe73155bc..246bf9aaf9df 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1000,7 +1000,7 @@ struct mm_struct *get_task_mm(struct task_struct *task) if (task->flags & PF_KTHREAD) mm = NULL; else - atomic_inc(&mm->mm_users); + mmget(mm); } task_unlock(task); return mm; @@ -1188,7 +1188,7 @@ static int copy_mm(unsigned long clone_flags, struct task_struct *tsk) vmacache_flush(tsk); if (clone_flags & CLONE_VM) { - atomic_inc(&oldmm->mm_users); + mmget(oldmm); mm = oldmm; goto good_mm; } -- cgit