[PATCH 4.2 063/134] x86/mm: Initialize pmd_idx in page_table_range_init_count()

From: Greg Kroah-Hartman
Date: Sat Sep 26 2015 - 16:58:55 EST

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


From: Minfei Huang <mnfhuang@xxxxxxxxx>

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@xxxxxxxxx>
Cc: tony.luck@xxxxxxxxx
Cc: wangnan0@xxxxxxxxxx
Cc: david.vrabel@xxxxxxxxxx
Reviewed-by: yinghai@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1436703522-29552-1-git-send-email-mhuang@xxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

arch/x86/mm/init_32.c | 1 +
1 file changed, 1 insertion(+)

--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -137,6 +137,7 @@ page_table_range_init_count(unsigned lon

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);

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/