This is a note to let you know that I've just added the patch titled
ARM: 8685/1: ensure memblock-limit is pmd-aligned
to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-8685-1-ensure-memblock-limit-is-pmd-aligned.patch
and it can be found in the queue-4.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9e25ebfe56ece7541cd10a20d715cbdd148a2e06 Mon Sep 17 00:00:00 2001
From: Doug Berger <opendmb@xxxxxxxxx>
Date: Thu, 29 Jun 2017 18:41:36 +0100
Subject: ARM: 8685/1: ensure memblock-limit is pmd-aligned
From: Doug Berger <opendmb@xxxxxxxxx>
commit 9e25ebfe56ece7541cd10a20d715cbdd148a2e06 upstream.
The pmd containing memblock_limit is cleared by prepare_page_table()
which creates the opportunity for early_alloc() to allocate unmapped
memory if memblock_limit is not pmd aligned causing a boot-time hang.
Commit 965278dcb8ab ("ARM: 8356/1: mm: handle non-pmd-aligned end of RAM")
attempted to resolve this problem, but there is a path through the
adjust_lowmem_bounds() routine where if all memory regions start and
end on pmd-aligned addresses the memblock_limit will be set to
arm_lowmem_limit.
Since arm_lowmem_limit can be affected by the vmalloc early parameter,
the value of arm_lowmem_limit may not be pmd-aligned. This commit
corrects this oversight such that memblock_limit is always rounded
down to pmd-alignment.
Fixes: 965278dcb8ab ("ARM: 8356/1: mm: handle non-pmd-aligned end of RAM")
Signed-off-by: Doug Berger <opendmb@xxxxxxxxx>
Suggested-by: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mm/mmu.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1216,15 +1216,15 @@ void __init adjust_lowmem_bounds(void)
high_memory = __va(arm_lowmem_limit - 1) + 1;
+ if (!memblock_limit)
+ memblock_limit = arm_lowmem_limit;
+
/*
* Round the memblock limit down to a pmd size. This
* helps to ensure that we will allocate memory from the
* last full pmd, which should be mapped.
*/
- if (memblock_limit)
- memblock_limit = round_down(memblock_limit, PMD_SIZE);
- if (!memblock_limit)
- memblock_limit = arm_lowmem_limit;
+ memblock_limit = round_down(memblock_limit, PMD_SIZE);
if (!IS_ENABLED(CONFIG_HIGHMEM) || cache_is_vipt_aliasing()) {
if (memblock_end_of_DRAM() > arm_lowmem_limit) {
Patches currently in stable-queue which might be from opendmb@xxxxxxxxx are
queue-4.11/arm-8685-1-ensure-memblock-limit-is-pmd-aligned.patch