linux-kernel - [PATCH] arm: Update memblock limit after mapping lowmem

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Date:	Thu,  4 Jun 2015 12:15:49 -0700
From:	Laura Abbott <labbott@...oraproject.org>
To:	Russell King <linux@....linux.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Arnd Bergmann <arnd@...db.de>, Nicolas Pitre <nico@...aro.org>,
	Stefan Agner <stefan@...er.ch>
Cc:	Laura Abbott <labbott@...oraproject.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Hans de Goede <hdegoede@...hat.com>
Subject: [PATCH] arm: Update memblock limit after mapping lowmem


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@...oraproject.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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