Allow softlockup to be runtime disabled

It's useful sometimes to disable the softlockup checker at boottime. Especially if it triggers during a distro install. Signed-off-by: Dave Jones <[email protected]> Cc: Ingo Molnar <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
iegor · Jul 16, 2007 · 9784221 · 9784221
1 parent ea5a3dc
commit 9784221
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
@@ -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.
 
+	nosoftlockup	[KNL] Disable the soft-lockup detector.
+
 	nosync		[HW,M68K] Disables sync negotiation for all devices.
 
 	notsc		[BUGS=IA-32] Disable Time Stamp Counter

diff --git a/init/main.c b/init/main.c
@@ -728,6 +728,15 @@ static void __init do_basic_setup(void)
 	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)
 {
 	extern int spawn_ksoftirqd(void);
@@ -737,7 +746,8 @@ static void __init do_pre_smp_initcalls(void)
 	migration_init();
 #endif
 	spawn_ksoftirqd();
-	spawn_softlockup_task();
+	if (!nosoftlockup)
+		spawn_softlockup_task();
 }
 
 static void run_init_process(char *init_filename)