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Message-Id: <1431399221-25337-1-git-send-email-labbott@fedoraproject.org>
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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