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 <[email protected]> Signed-off-by: Naoya Horiguchi <[email protected]> Cc: [email protected] --- fs/proc/task_mmu.c | 1 - 1 files changed, 0 insertions(+), 1 deletions(-) diff --git linux-3.3.0-6658a6991ce.orig/fs/proc/task_mmu.c linux-3.3.0-6658a6991ce/fs/proc/task_mmu.c index 9694cc2..06d2b70 100644 --- linux-3.3.0-6658a6991ce.orig/fs/proc/task_mmu.c +++ linux-3.3.0-6658a6991ce/fs/proc/task_mmu.c @@ -786,7 +786,6 @@ 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; -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
