2007-06-12 03:14:09

by Dave Jones

Subject: 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]>

--- linux-2.6/init/main.c~ 2006-03-05 00:45:51.000000000 -0500
+++ linux-2.6/init/main.c 2006-03-05 00:49:41.000000000 -0500
@@ -732,6 +732,15 @@ 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);
@@ -649,7 +657,8 @@ static void 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)

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2007-06-12 11:49:52

by Peter Zijlstra

Subject: Re: Allow softlockup to be runtime disabled.

On Mon, 2007-06-11 at 23:13 -0400, Dave Jones wrote:
> It's useful sometimes to disable the softlockup checker at boottime.
> Especially if it triggers during a distro install.

Should we not rather fix these occurrences?

2007-06-12 18:04:08

by Dave Jones

Subject: Re: Allow softlockup to be runtime disabled.

On Tue, Jun 12, 2007 at 01:49:45PM +0200, Peter Zijlstra wrote:
> On Mon, 2007-06-11 at 23:13 -0400, Dave Jones wrote:
> > It's useful sometimes to disable the softlockup checker at boottime.
> > Especially if it triggers during a distro install.
>
> Should we not rather fix these occurrences?

We do, but we can't easily fix the kernel that ends up on
install media. It's easier to tell a user
"boot with nosoftlockup, then update your kernel after its installed"
than it is to guide them through reconstructing an ISO with
an updated kernel.

Dave

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