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[PATCH] setup_boot_APIC_clock() irq-enable fix 

latest -git triggers an irqtrace/lockdep warning of a leaked
irqs-off condition:

  BUG: at kernel/fork.c:1033 copy_process()

after some debugging it turns out that commit ca1b940c accidentally left
interrupts disabled - which trickled down all the way to the first time
we fork a kernel thread and triggered the warning.

the fix is to re-enable interrupts in the 'else' branch of
setup_boot_APIC_clock()'s pmtimers calibration path.

Reported-by: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Thomas Gleixner <tglx@brown.paperbag.linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ingo Molnar 2007-03-22 10:31:19 +01:00 committed by Linus Torvalds
parent 9c35dd7f8b
commit 4edc5db83f
1 changed files with 2 additions and 1 deletions
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3
arch/i386/kernel/apic.c
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@ -506,7 +506,8 @@ void __init setup_boot_APIC_clock(void)
apic_printk(APIC_VERBOSE, "... jiffies result ok\n");
else
local_apic_timer_verify_ok = 0;
}
} else
local_irq_enable();
if (!local_apic_timer_verify_ok) {
printk(KERN_WARNING