[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>
diff --git a/arch/ia64/kernel/unaligned.c b/arch/ia64/kernel/unaligned.c
index ff0e7c1..6db0859 100644
--- a/arch/ia64/kernel/unaligned.c
+++ b/arch/ia64/kernel/unaligned.c
@@ -59,6 +59,7 @@
* (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 @@
}
}
} 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);
}
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 3e38b74..368d163 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -144,6 +144,7 @@
#ifdef CONFIG_IA64
extern int no_unaligned_warning;
+extern int unaligned_dump_stack;
#endif
#ifdef CONFIG_RT_MUTEXES
@@ -781,6 +782,14 @@
.mode = 0644,
.proc_handler = &proc_dointvec,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "unaligned-dump-stack",
+ .data = &unaligned_dump_stack,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
#endif
#ifdef CONFIG_DETECT_SOFTLOCKUP
{