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ARM: 8394/1: update memblock limit after mapping lowmem

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The memblock limit is currently used in find_limits
to find the bounds for ZONE_NORMAL. The memblock
limit may need to be rounded down a PMD size to ensure
allocations are fully mapped though. This has the side
effect of reducing the amount of memory in ZONE_NORMAL.
Once all lowmem is mapped, it's safe to change the memblock
limit back to include the unaligned section. Adjust the
memblock limit after lowmem mapping is complete.

Before:
 # cat /proc/zoneinfo | grep managed
        managed  62907
        managed  424

After:
 # cat /proc/zoneinfo | grep managed
        managed  63331

Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Laura Abbott 2015-06-25 01:04:20 +01:00 committed by Russell King
parent 398f74569c
commit 3de1f52a3a
1 changed files with 1 additions and 0 deletions
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arch/arm/mm/mmu.c
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@ -1519,6 +1519,7 @@ void __init paging_init(const struct machine_desc *mdesc)
build_mem_type_table();
prepare_page_table();
map_lowmem();
memblock_set_current_limit(arm_lowmem_limit);
dma_contiguous_remap();
devicemaps_init(mdesc);
kmap_init();