watchdog: Disallow setting watchdog_thresh to -1
In old kernels, it's allowed to set softlockup_thresh to -1 or 0
to disable softlockup detection. However watchdog_thresh only
uses 0 to disable detection, and setting it to -1 just froze my
box and nothing I can do but reboot.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Don Zickus <dzickus@redhat.com>
Link: http://lkml.kernel.org/r/51959668.9040106@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 9edcf45..b0a1f99 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -120,7 +120,6 @@
/* Constants used for minimum and maximum */
#ifdef CONFIG_LOCKUP_DETECTOR
static int sixty = 60;
-static int neg_one = -1;
#endif
static int zero;
@@ -814,7 +813,7 @@
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dowatchdog,
- .extra1 = &neg_one,
+ .extra1 = &zero,
.extra2 = &sixty,
},
{