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authorDoug Chapman <doug.chapman@hp.com>2009-01-15 10:38:56 -0800
committerTony Luck <tony.luck@intel.com>2009-01-15 10:38:56 -0800
commit88fc241f54459ac3d86c5e13b449730199f66061 (patch)
treed8148e145e9252b76b12b8d466ff3ecbfa4222ea /arch/ia64/kernel/unaligned.c
parent0773a6cf673316440999752e23f8c3d4f85e48b9 (diff)
[IA64] dump stack on kernel unaligned warnings
Often the cause of kernel unaligned access warnings is not obvious from just the ip displayed in the warning. This adds the option via proc to dump the stack in addition to the warning. The default is off (just display the 1 line warning). To enable the stack to be shown: echo 1 > /proc/sys/kernel/unaligned-dump-stack Signed-off-by: Doug Chapman <doug.chapman@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/unaligned.c')
-rw-r--r--arch/ia64/kernel/unaligned.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/ia64/kernel/unaligned.c b/arch/ia64/kernel/unaligned.c
index ff0e7c10faa7..6db08599ebbc 100644
--- a/arch/ia64/kernel/unaligned.c
+++ b/arch/ia64/kernel/unaligned.c
@@ -59,6 +59,7 @@ dump (const char *str, void *vp, size_t len)
* (i.e. don't allow attacker to fill up logs with unaligned accesses).
*/
int no_unaligned_warning;
+int unaligned_dump_stack;
static int noprint_warning;
/*
@@ -1371,9 +1372,12 @@ ia64_handle_unaligned (unsigned long ifa, struct pt_regs *regs)
}
}
} else {
- if (within_logging_rate_limit())
+ if (within_logging_rate_limit()) {
printk(KERN_WARNING "kernel unaligned access to 0x%016lx, ip=0x%016lx\n",
ifa, regs->cr_iip + ipsr->ri);
+ if (unaligned_dump_stack)
+ dump_stack();
+ }
set_fs(KERNEL_DS);
}