linux-kernel - [ 20/37] ARM: mxs: Remove MMAP_MIN_ADDR setting from mxs

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Message-Id: <20120817030246.875440689@decadent.org.uk>
Date:	Fri, 17 Aug 2012 04:03:03 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Marek Vasut <marex@...x.de>,
	Russell King <linux@....linux.org.uk>,
	Wolfgang Denk <wd@...x.de>, Shawn Guo <shawn.guo@...aro.org>
Subject: [ 20/37] ARM: mxs: Remove MMAP_MIN_ADDR setting from mxs_defconfig

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marek Vasut <marex@...x.de>

commit 3bed491c8d28329e34f8a31e3fe64d03f3a350f1 upstream.

The CONFIG_DEFAULT_MMAP_MIN_ADDR was set to 65536 in mxs_defconfig,
this caused severe breakage of userland applications since the upper
limit for ARM is 32768. By default CONFIG_DEFAULT_MMAP_MIN_ADDR is
set to 4096 and can also be changed via /proc/sys/vm/mmap_min_addr
if needed.

Quoting Russell King [1]:

"4096 is also fine for ARM too. There's not much point in having
defconfigs change it - that would just be pure noise in the config
files."

the CONFIG_DEFAULT_MMAP_MIN_ADDR can be removed from the defconfig
altogether.

This problem was introduced by commit cde7c41 (ARM: configs: add
defconfig for mach-mxs).

[1] http://marc.info/?l=linux-arm-kernel&m=134401593807820&w=2

Signed-off-by: Marek Vasut <marex@...x.de>
Cc: Russell King <linux@....linux.org.uk>
Cc: Wolfgang Denk <wd@...x.de>
Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/arm/configs/mxs_defconfig |    1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/configs/mxs_defconfig b/arch/arm/configs/mxs_defconfig
index ccdb635..4edcfb4 100644
--- a/arch/arm/configs/mxs_defconfig
+++ b/arch/arm/configs/mxs_defconfig
@@ -34,7 +34,6 @@ CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_PREEMPT_VOLUNTARY=y
 CONFIG_AEABI=y
-CONFIG_DEFAULT_MMAP_MIN_ADDR=65536
 CONFIG_AUTO_ZRELADDR=y
 CONFIG_FPE_NWFPE=y
 CONFIG_NET=y

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