[3.19.y-ckt stable] Patch "x86/mm: Initialize pmd_idx in page_table_range_init_count()" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    x86/mm: Initialize pmd_idx in page_table_range_init_count()

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt8.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From f65616c1d5bbe37701c23034cdc3776acb7f9310 Mon Sep 17 00:00:00 2001
From: Minfei Huang <mnfhuang at gmail.com>
Date: Sun, 12 Jul 2015 20:18:42 +0800
Subject: x86/mm: Initialize pmd_idx in page_table_range_init_count()

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 at gmail.com>
Cc: tony.luck at intel.com
Cc: wangnan0 at huawei.com
Cc: david.vrabel at citrix.com
Reviewed-by: yinghai at kernel.org
Link: http://lkml.kernel.org/r/1436703522-29552-1-git-send-email-mhuang@redhat.com
Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
Signed-off-by: Kamal Mostafa <kamal at canonical.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 c8140e1..c23ab1e 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);
--
1.9.1