From: Shaohua Li <shaohua.li@intel.com>
Date: Fri, 8 Jul 2011 22:39:41 +0000 (-0700)
Subject: mm: __tlb_remove_page() check the correct batch
X-Git-Tag: firefly_0821_release~3680^2~5090
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0b43c3aab0137595335b08b340a3f3e5af9818a6;p=firefly-linux-kernel-4.4.55.git

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 <shaohua.li@intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/memory.c b/mm/memory.c
index 40b7531ee8ba..9b8a01d941cb 100644
--- 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);