Messages in this thread Patch in this message | | | From | Laura Abbott <> | Subject | [PATCH] arm: Update memblock limit after mapping lowmem | Date | Thu, 4 Jun 2015 12:15:49 -0700 |
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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> --- This is a replacement for 'arm: Don't use memblock limit for the lowmem bound' which doesn't actually work on NOMMU systems. --- arch/arm/mm/mmu.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 7186382..904d153 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -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(); -- 2.4.1
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