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[PATCH] lockdep: annotate genirq 

Teach special (recursive) locking code to the lock validator.  Has no effect
on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-07-03 00:25:06 -07:00 committed by Linus Torvalds
parent 8b8f319fc7
commit 243c7621aa
3 changed files with 23 additions and 0 deletions
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6
include/linux/lockdep.h
View File

@ -270,6 +270,12 @@ static inline int lockdep_internal(void)
struct lock_class_key { };
#endif /* !LOCKDEP */
#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS)
extern void early_init_irq_lock_class(void);
#else
# define early_init_irq_lock_class() do { } while (0)
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
extern void early_boot_irqs_off(void);
extern void early_boot_irqs_on(void);

1
init/main.c
View File

@ -466,6 +466,7 @@ asmlinkage void __init start_kernel(void)
local_irq_disable();
early_boot_irqs_off();
early_init_irq_lock_class();
/*
* Interrupts are still disabled. Do necessary setups, then

16
kernel/irq/handle.c
View File

@ -249,3 +249,19 @@ out:
return 1;
}
#ifdef CONFIG_TRACE_IRQFLAGS
/*
* lockdep: we want to handle all irq_desc locks as a single lock-class:
*/
static struct lock_class_key irq_desc_lock_class;
void early_init_irq_lock_class(void)
{
int i;
for (i = 0; i < NR_IRQS; i++)
lockdep_set_class(&irq_desc[i].lock, &irq_desc_lock_class);
}
#endif