linux-kernel - [PATCH] Use flush tlb last level when change protection

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Date:   Sat, 23 Feb 2019 14:47:27 +0800
From:   Xuefeng Wang <wxf.wang@...ilicon.com>
To:     <catalin.marinas@....com>, <will.deacon@....com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <wxf.wang@...ilicon.com>, <guohanjun@...wei.com>
Subject: [PATCH] Use flush tlb last level when change protection

The protection attributes are only kept in last level tlb, so
protection changing only need invalidate last level tlb, exclude
the PWC entries.

Signed-off-by: Xuefeng Wang <wxf.wang@...ilicon.com>
---
 mm/mprotect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 36cb358..0c4303d 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -287,7 +287,7 @@ static unsigned long change_protection_range(struct vm_area_struct *vma,
 
 	/* Only flush the TLB if we actually modified any entries: */
 	if (pages)
-		flush_tlb_range(vma, start, end);
+		__flush_tlb_range(vma, start, end, PAGE_SIZE, true);
 	dec_tlb_flush_pending(mm);
 
 	return pages;
-- 
1.7.12.4