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authorDon Zickus <dzickus@redhat.com>2015-11-05 18:44:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-05 19:34:48 -0800
commitac1f591249d95372f3a5ab3828d4af5dfbf5efd3 (patch)
tree39dfce1a0fc12de79689cd97e2876ddf777c8cab /kernel/sysctl.c
parent55537871ef666b4153fd1ef8782e4a13fee142cc (diff)
downloadlinux-sh-ac1f591249d95372f3a5ab3828d4af5dfbf5efd3.tar.gz
kernel/watchdog.c: add sysctl knob hardlockup_panic
The only way to enable a hardlockup to panic the machine is to set 'nmi_watchdog=panic' on the kernel command line. This makes it awkward for end users and folks who want to run automate tests (like myself). Mimic the softlockup_panic knob and create a /proc/sys/kernel/hardlockup_panic knob. Signed-off-by: Don Zickus <dzickus@redhat.com> Cc: Ulrich Obergfell <uobergfe@redhat.com> Acked-by: Jiri Kosina <jkosina@suse.cz> Reviewed-by: Aaron Tomlin <atomlin@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sysctl.c')
-rw-r--r--kernel/sysctl.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 1a5faa3e1521..dc6858d6639e 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -888,6 +888,17 @@ static struct ctl_table kern_table[] = {
.extra1 = &zero,
.extra2 = &one,
},
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+ {
+ .procname = "hardlockup_panic",
+ .data = &hardlockup_panic,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
+#endif
#ifdef CONFIG_SMP
{
.procname = "softlockup_all_cpu_backtrace",