From 10bdfb5ef7e1a429a3de31e498942a8ae5749a46 Mon Sep 17 00:00:00 2001 From: Naoya Horiguchi Date: Thu, 29 Mar 2012 13:58:17 -0700 Subject: [PATCH] pagemap: remove remaining unneeded spin_lock() Commit 025c5b2451e4 ("thp: optimize away unnecessary page table locking") moves spin_lock() into pmd_trans_huge_lock() in order to avoid locking unless pmd is for thp. So this spin_lock() is a bug. Reported-by: Sasha Levin Signed-off-by: Naoya Horiguchi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/task_mmu.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index c283832..2b9a760 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -783,7 +783,6 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, /* find the first VMA at or above 'addr' */ vma = find_vma(walk->mm, addr); - spin_lock(&walk->mm->page_table_lock); if (pmd_trans_huge_lock(pmd, vma) == 1) { for (; addr != end; addr += PAGE_SIZE) { unsigned long offset; -- 2.7.4