mm: __tlb_remove_page() check the correct batch

__tlb_remove_page() switches to a new batch page, but still checks space
in the old batch.  This check always fails, and causes a forced tlb flush.

Signed-off-by: Shaohua Li <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/memory.c b/mm/memory.c
index 40b7531ee8badb288823b64715265d0f16be397d..9b8a01d941cbc77dc0b1674fd817b54bb4f281f4 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -305,6 +305,7 @@ int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
        if (batch->nr == batch->max) {
                if (!tlb_next_batch(tlb))
                        return 0;
+               batch = tlb->active;
        }
        VM_BUG_ON(batch->nr > batch->max);