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[POWERPC] Make soft_enabled irqs preempt safe

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Rewrite local_get_flags and local_irq_disable to use r13 explicitly,
to avoid the risk that gcc will split get_paca()->soft_enabled into a
sequence unsafe against preemption.  Similar care in local_irq_restore.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Hugh Dickins 2006-11-10 21:32:40 +00:00 • committed by Paul Mackerras
commit ef2b343e99
2 changed files with 67 additions and 10 deletions
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20
include/asm-powerpc/hw_irq.h
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@ -18,15 +18,25 @@ extern void timer_interrupt(struct pt_regs *);
static inline unsigned long local_get_flags(void)
{
return get_paca()->soft_enabled;
unsigned long flags;
__asm__ __volatile__("lbz %0,%1(13)"
: "=r" (flags)
: "i" (offsetof(struct paca_struct, soft_enabled)));
return flags;
}
static inline unsigned long local_irq_disable(void)
{
unsigned long flag = get_paca()->soft_enabled;
get_paca()->soft_enabled = 0;
barrier();
return flag;
unsigned long flags, zero;
__asm__ __volatile__("li %1,0; lbz %0,%2(13); stb %1,%2(13)"
: "=r" (flags), "=&r" (zero)
: "i" (offsetof(struct paca_struct, soft_enabled))
: "memory");
return flags;
}
extern void local_irq_restore(unsigned long);