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Allow softlockup to be runtime disabled

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It's useful sometimes to disable the softlockup checker at boottime.
Especially if it triggers during a distro install.

Signed-off-by: Dave Jones <davej@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Jones
2007-07-15 23:41:05 -07:00
committed by Linus Torvalds
parent ea5a3dcfda
commit 97842216b8
2 changed files with 13 additions and 1 deletions
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2
Documentation/kernel-parameters.txt
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@@ -1181,6 +1181,8 @@ and is between 256 and 4096 characters. It is defined in the file
nosmp [SMP] Tells an SMP kernel to act as a UP kernel. nosmp [SMP] Tells an SMP kernel to act as a UP kernel.
nosoftlockup [KNL] Disable the soft-lockup detector.
nosync [HW,M68K] Disables sync negotiation for all devices. nosync [HW,M68K] Disables sync negotiation for all devices.
notsc [BUGS=IA-32] Disable Time Stamp Counter notsc [BUGS=IA-32] Disable Time Stamp Counter

12
init/main.c
View File

@@ -728,6 +728,15 @@ static void __init do_basic_setup(void)
do_initcalls(); do_initcalls();
} }
static int __initdata nosoftlockup;
static int __init nosoftlockup_setup(char *str)
{
nosoftlockup = 1;
return 1;
}
__setup("nosoftlockup", nosoftlockup_setup);
static void __init do_pre_smp_initcalls(void) static void __init do_pre_smp_initcalls(void)
{ {
extern int spawn_ksoftirqd(void); extern int spawn_ksoftirqd(void);
@@ -737,7 +746,8 @@ static void __init do_pre_smp_initcalls(void)
migration_init(); migration_init();
#endif #endif
spawn_ksoftirqd(); spawn_ksoftirqd();
spawn_softlockup_task(); if (!nosoftlockup)
spawn_softlockup_task();
} }
static void run_init_process(char *init_filename) static void run_init_process(char *init_filename)