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mm/huge_memory.c: minor lock simplification in __khugepaged_exit

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The lock is released first thing in all three branches.  Simplify this by
unconditionally releasing lock and remove else clause which was only there
to be sure lock was released.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Johannes Weiner <jweiner@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chris Wright 2011-07-25 17:12:14 -07:00 committed by Linus Torvalds
parent 1bb36fbd4d
commit d788e80a8c
1 changed files with 2 additions and 4 deletions
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6
mm/huge_memory.c
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@ -1596,14 +1596,13 @@ void __khugepaged_exit(struct mm_struct *mm)
list_del(&mm_slot->mm_node);
free = 1;
}
spin_unlock(&khugepaged_mm_lock);
if (free) {
spin_unlock(&khugepaged_mm_lock);
clear_bit(MMF_VM_HUGEPAGE, &mm->flags);
free_mm_slot(mm_slot);
mmdrop(mm);
} else if (mm_slot) {
spin_unlock(&khugepaged_mm_lock);
/*
* This is required to serialize against
* khugepaged_test_exit() (which is guaranteed to run
@ -1614,8 +1613,7 @@ void __khugepaged_exit(struct mm_struct *mm)
*/
down_write(&mm->mmap_sem);
up_write(&mm->mmap_sem);
} else
spin_unlock(&khugepaged_mm_lock);
}
}
static void release_pte_page(struct page *page)