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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-02-20 17:13:29 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-02-20 17:20:49 +0100
commitd944d549aa86e08cba080396513234cf048fee1f (patch)
tree53d825ec3441de0bddf48ba34304510497e26343
parentARM: Update mach-types (diff)
downloadlinux-d944d549aa86e08cba080396513234cf048fee1f.tar.xz
linux-d944d549aa86e08cba080396513234cf048fee1f.zip
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>
-rw-r--r--Documentation/kernel-parameters.txt5
-rw-r--r--arch/arm/mm/alignment.c3
2 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 826b6e148316..e7848a0d99eb 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -315,6 +315,11 @@ and is between 256 and 4096 characters. It is defined in the file
aic79xx= [HW,SCSI]
See Documentation/scsi/aic79xx.txt.
+ alignment= [KNL,ARM]
+ Allow the default userspace alignment fault handler
+ behaviour to be specified. Bit 0 enables warnings,
+ bit 1 enables fixups, and bit 2 sends a segfault.
+
amd_iommu= [HW,X86-84]
Pass parameters to the AMD IOMMU driver in the system.
Possible values are:
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 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+#include <linux/moduleparam.h>
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/errno.h>
@@ -77,6 +78,8 @@ static unsigned long ai_dword;
static unsigned long ai_multi;
static int ai_usermode;
+core_param(alignment, ai_usermode, int, 0600);
+
#define UM_WARN (1 << 0)
#define UM_FIXUP (1 << 1)
#define UM_SIGNAL (1 << 2)