[PATCH 4.4 090/101] ARM: 8685/1: ensure memblock-limit is pmd-aligned

From: Greg Kroah-Hartman
Date: Mon Jul 03 2017 - 09:40:27 EST

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


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

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
@@ -1184,15 +1184,15 @@ void __init sanity_check_meminfo(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);