linux-kernel - [PATCH 3.16.y-ckt 088/133] x86/mm: Initialize pmd_idx in page_table_range_init

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Message-Id: <1443606681-7124-89-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 30 Sep 2015 10:50:36 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Minfei Huang <mnfhuang@...il.com>, tony.luck@...el.com,
	wangnan0@...wei.com, david.vrabel@...rix.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 088/133] x86/mm: Initialize pmd_idx in page_table_range_init_count()

3.16.7-ckt18 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Minfei Huang <mnfhuang@...il.com>

commit 9962eea9e55f797f05f20ba6448929cab2a9f018 upstream.

The variable pmd_idx is not initialized for the first iteration of the
for loop.

Assign the proper value which indexes the start address.

Fixes: 719272c45b82 'x86, mm: only call early_ioremap_page_table_range_init() once'
Signed-off-by: Minfei Huang <mnfhuang@...il.com>
Cc: tony.luck@...el.com
Cc: wangnan0@...wei.com
Cc: david.vrabel@...rix.com
Reviewed-by: yinghai@...nel.org
Link: http://lkml.kernel.org/r/1436703522-29552-1-git-send-email-mhuang@redhat.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 arch/x86/mm/init_32.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index e39504878aec..a7b5b3071072 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -137,6 +137,7 @@ page_table_range_init_count(unsigned long start, unsigned long end)
 
 	vaddr = start;
 	pgd_idx = pgd_index(vaddr);
+	pmd_idx = pmd_index(vaddr);
 
 	for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd_idx++) {
 		for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
--
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