[PATCH] Make hard_irq_disable() actually hard-disable interrupts

At present, hard_irq_disable() does nothing because of this code in
include/linux/interrupt.h:

#ifndef hard_irq_disable
#define hard_irq_disable()	do { } while(0)
#endif

So we need to make our hard_irq_disable() be a macro.

Signed-off-by: Paul Mackerras <redacted>

---
 arch/powerpc/include/asm/hw_irq.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index c9aac24..d8f873f 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h

@@ -93,12 +93,13 @@ static inline bool arch_irqs_disabled(void)
 #define __hard_irq_disable()	__mtmsrd(local_paca->kernel_msr, 1)
 #endif
 
-static inline void hard_irq_disable(void)
+static inline void _hard_irq_disable(void)
 {
 	__hard_irq_disable();
 	get_paca()->soft_enabled = 0;
 	get_paca()->irq_happened |= PACA_IRQ_HARD_DIS;
 }
+#define hard_irq_disable()	_hard_irq_disable()
 
 /*
  * This is called by asynchronous interrupts to conditionally

On Thu, 2012-06-14 at 20:31 +1000, Paul Mackerras wrote:

At present, hard_irq_disable() does nothing because of this code in
include/linux/interrupt.h:

#ifndef hard_irq_disable
#define hard_irq_disable()	do { } while(0)
#endif

So we need to make our hard_irq_disable() be a macro.

Signed-off-by: Paul Mackerras <redacted>

This was broken by my rewrite of the lazy irq stuff when I turned that
from a macro to a function. So it should be CC'ed to stable 3.4.

Also I think it's simpler (and we do that commonly) to just do

#define hard_irq_disable hard_irq_disable

Cheers,
Ben.