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softlockup: fix softlockup_thresh unaligned access and disable detection at runtime

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Fix unaligned access errors when setting softlockup_thresh on
64 bit platforms.

Allow softlockup detection to be disabled by setting
softlockup_thresh <= 0.

Detect that boot time softlockup detection has been disabled
earlier in softlockup_tick.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Dimitri Sivanich
2008-05-12 21:21:14 +02:00
committed by Thomas Gleixner
parent 9c44bc03ff
commit 9383d96790
3 changed files with 16 additions and 7 deletions
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9
kernel/sysctl.c
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@@ -84,12 +84,13 @@ extern int latencytop_enabled;
extern int sysctl_nr_open_min, sysctl_nr_open_max;
/* Constants used for minimum and maximum */
#if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
#ifdef CONFIG_HIGHMEM
static int one = 1;
#endif
#ifdef CONFIG_DETECT_SOFTLOCKUP
static int sixty = 60;
static int neg_one = -1;
#endif
#ifdef CONFIG_MMU
@@ -742,11 +743,11 @@ static struct ctl_table kern_table[] = {
.ctl_name = CTL_UNNUMBERED,
.procname = "softlockup_thresh",
.data = &softlockup_thresh,
.maxlen = sizeof(unsigned long),
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_doulongvec_minmax,
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra1 = &neg_one,
.extra2 = &sixty,
},
{