linux-kernel - [patch 2/5]thp: remove unnecessary tlb flush for mprotect

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Date:	Tue, 25 Oct 2011 10:59:25 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	aarcange@...hat.com, Hugh Dickins <hughd@...gle.com>,
	linux-mm <linux-mm@...ck.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [patch 2/5]thp: remove unnecessary tlb flush for mprotect

change_protection() will do TLB flush later, don't need duplicate tlb flush.

Signed-off-by: Shaohua Li <shaohua.li@...el.com>
---
 mm/huge_memory.c |    1 -
 1 file changed, 1 deletion(-)

Index: linux/mm/huge_memory.c
===================================================================
--- linux.orig/mm/huge_memory.c	2011-10-24 19:24:31.000000000 +0800
+++ linux/mm/huge_memory.c	2011-10-24 19:25:10.000000000 +0800
@@ -1079,7 +1079,6 @@ int change_huge_pmd(struct vm_area_struc
 			entry = pmd_modify(entry, newprot);
 			set_pmd_at(mm, addr, pmd, entry);
 			spin_unlock(&vma->vm_mm->page_table_lock);
-			flush_tlb_range(vma, addr, addr + HPAGE_PMD_SIZE);
 			ret = 1;
 		}
 	} else


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