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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-02-20 11:13:29 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-02-20 11:20:49 -0500
commitd944d549aa86e08cba080396513234cf048fee1f (patch)
tree53d825ec3441de0bddf48ba34304510497e26343 /arch/arm/mm/alignment.c
parent0fa11802e0dcbd4e211a9310500bf52d701b9c1b (diff)
ARM: allow alignment fault mode to be configured at kernel boot
Some glibc versions intentionally create lots of alignment faults in their gconv code, which if not fixed up, results in segfaults during boot. This can prevent systems booting properly. There is no clear hard-configurable default for this; the desired default depends on the nature of the userspace which is going to be booted. So, provide a way for the alignment fault handler to be configured via the kernel command line. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/alignment.c')
-rw-r--r--arch/arm/mm/alignment.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c
index b270d6228fe2..62820eda84d9 100644
--- a/arch/arm/mm/alignment.c
+++ b/arch/arm/mm/alignment.c
@@ -11,6 +11,7 @@
11 * it under the terms of the GNU General Public License version 2 as 11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation. 12 * published by the Free Software Foundation.
13 */ 13 */
14#include <linux/moduleparam.h>
14#include <linux/compiler.h> 15#include <linux/compiler.h>
15#include <linux/kernel.h> 16#include <linux/kernel.h>
16#include <linux/errno.h> 17#include <linux/errno.h>
@@ -77,6 +78,8 @@ static unsigned long ai_dword;
77static unsigned long ai_multi; 78static unsigned long ai_multi;
78static int ai_usermode; 79static int ai_usermode;
79 80
81core_param(alignment, ai_usermode, int, 0600);
82
80#define UM_WARN (1 << 0) 83#define UM_WARN (1 << 0)
81#define UM_FIXUP (1 << 1) 84#define UM_FIXUP (1 << 1)
82#define UM_SIGNAL (1 << 2) 85#define UM_SIGNAL (1 << 2)