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watchdog: Disallow setting watchdog_thresh to -1

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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>
This commit is contained in:
Li Zefan 2013-05-17 10:31:04 +08:00 committed by Ingo Molnar
parent 1b45adcd9a
commit a6572f84c5
1 changed files with 1 additions and 2 deletions
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3
kernel/sysctl.c
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@ -120,7 +120,6 @@ extern int blk_iopoll_enabled;
/* 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 @@ static struct ctl_table kern_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dowatchdog,
.extra1 = &neg_one,
.extra1 = &zero,
.extra2 = &sixty,
},
{