Commit c01d403b authored by Ingo Molnar's avatar Ingo Molnar Committed by Linus Torvalds
Browse files

[PATCH] lockdep: add disable/enable_irq_lockdep() API 



lockdep wants to use the disable_irq()/enable_irq() prototypes before they are
provied by the platform's asm/irq.h.  So move them out of the
CONFIG_GENERIC_HARDIRQS define - all architectures have a common prototype for
this anyway.

Add special lockdep variants of irq line disabling/enabling.

These should be used for locking constructs that know that a particular irq
context which is disabled, and which is the only irq-context user of a lock,
that it's safe to take the lock in the irq-disabled section without disabling
hardirqs.

[akpm@osdl.org: build fix]
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent a875a69f

include/linux/interrupt.h

+48 −1
Original line number Diff line number Diff line
@@ -86,6 +86,41 @@ extern void disable_irq_nosync(unsigned int irq); 
extern void disable_irq(unsigned int irq);

extern void enable_irq(unsigned int irq);



/*

 * Special lockdep variants of irq disabling/enabling.

 * These should be used for locking constructs that

 * know that a particular irq context which is disabled,

 * and which is the only irq-context user of a lock,

 * that it's safe to take the lock in the irq-disabled

 * section without disabling hardirqs.

 *

 * On !CONFIG_LOCKDEP they are equivalent to the normal

 * irq disable/enable methods.

 */

static inline void disable_irq_nosync_lockdep(unsigned int irq)

{

	disable_irq_nosync(irq);

#ifdef CONFIG_LOCKDEP

	local_irq_disable();

#endif

}



static inline void disable_irq_lockdep(unsigned int irq)

{

	disable_irq(irq);

#ifdef CONFIG_LOCKDEP

	local_irq_disable();

#endif

}



static inline void enable_irq_lockdep(unsigned int irq)

{

#ifdef CONFIG_LOCKDEP

	local_irq_enable();

#endif

	enable_irq(irq);

}



/* IRQ wakeup (PM) control: */

extern int set_irq_wake(unsigned int irq, unsigned int on);
@@ -99,8 +134,20 @@ static inline int disable_irq_wake(unsigned int irq) 
	return set_irq_wake(irq, 0);

}



#else /* !CONFIG_GENERIC_HARDIRQS */

/*

 * NOTE: non-genirq architectures, if they want to support the lock

 * validator need to define the methods below in their asm/irq.h

 * files, under an #ifdef CONFIG_LOCKDEP section.

 */

# ifndef CONFIG_LOCKDEP

#  define disable_irq_nosync_lockdep(irq)	disable_irq_nosync(irq)

#  define disable_irq_lockdep(irq)		disable_irq(irq)

#  define enable_irq_lockdep(irq)		enable_irq(irq)

# endif



#endif /* CONFIG_GENERIC_HARDIRQS */



#ifndef __ARCH_SET_SOFTIRQ_PENDING

#define set_softirq_pending(x) (local_softirq_pending() = (x))

#define or_softirq_pending(x)  (local_softirq_pending() |= (x))

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