From d788e80a8c83ecdbdd55b6e985cced9cfe3a815b Mon Sep 17 00:00:00 2001 From: Chris Wright Date: Mon, 25 Jul 2011 17:12:14 -0700 Subject: [PATCH] mm/huge_memory.c: minor lock simplification in __khugepaged_exit 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 Reviewed-by: Michal Hocko Cc: Andrea Arcangeli Acked-by: Johannes Weiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/huge_memory.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 81532f29..e2d1587 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -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) -- 2.7.4