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add memory barrier to arch_local_irq_restore

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arch_local_irq_save() and friends are required to act as compiler
memory barriers. This patch adds a "memory" clobber to the inline
asm code in arch_local_irq_restore() which is used as the building
block for other functions needing to set/clear the interrupt enable
in the CSR register.

Signed-off-by: Mark Salter <msalter@redhat.com>
This commit is contained in:
Mark Salter 2013-04-09 15:35:46 -04:00
parent 31880c37c1
commit f934af05cb
1 changed files with 1 additions and 1 deletions
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2
arch/c6x/include/asm/irqflags.h
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@ -27,7 +27,7 @@ static inline unsigned long arch_local_save_flags(void)
/* set interrupt enabled status */
static inline void arch_local_irq_restore(unsigned long flags)
{
asm volatile (" mvc .s2 %0,CSR\n" : : "b"(flags));
asm volatile (" mvc .s2 %0,CSR\n" : : "b"(flags) : "memory");
}
/* unconditionally enable interrupts */