linux-kernel - [PATCH 06/15] mm: Clear pmd

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Message-Id: <1386060721-3794-7-git-send-email-mgorman@suse.de>
Date:	Tue,  3 Dec 2013 08:51:53 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Alex Thorlton <athorlton@....com>
Cc:	Rik van Riel <riel@...hat.com>, Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 06/15] mm: Clear pmd_numa before invalidating

pmdp_invalidate clears the present bit without taking into account that it
might be in the _PAGE_NUMA bit leaving the PMD in an unexpected state. Clear
pmd_numa before invalidating.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/pgtable-generic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index 3929a40..a7aefd3 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -191,6 +191,9 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
 void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
 		     pmd_t *pmdp)
 {
+	pmd_t entry = *pmdp;
+	if (pmd_numa(entry))
+		entry = pmd_mknonnuma(entry);
 	set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
 	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
 }
-- 
1.8.4

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