linux-kernel - [PATCH] arm: Don't use memblock limit for the lowmem bound

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Date:	Mon, 11 May 2015 19:53:41 -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@...hat.com>,
	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: Don't use memblock limit for the lowmem bound

From: Laura Abbott <labbott@...hat.com>

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.
Since we generally want to optimize for more lowmem, fix
this by using arm_lowmem_limit to calculate the bounds.
This what is used for actually mapping lowmem anyway.

Before:
# cat /proc/zoneinfo | grep managed
        managed  62920

After:
# cat /proc/zoneinfo | grep managed
        managed  63336



Signed-off-by: Laura Abbott <labbott@...hat.com>
---
 arch/arm/mm/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index be92fa0..b4f9513 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -89,7 +89,7 @@ __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 			       unsigned long *max_high)
 {
-	*max_low = PFN_DOWN(memblock_get_current_limit());
+	*max_low = PFN_DOWN(arm_lowmem_limit);
 	*min = PFN_UP(memblock_start_of_DRAM());
 	*max_high = PFN_DOWN(memblock_end_of_DRAM());
 }
-- 
2.1.0

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