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powerpc/irq: Move stack overflow check into a separate function 

Makes do_IRQ() shorter and clearer.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2009-04-22 15:31:37 +00:00 committed by Benjamin Herrenschmidt
parent f2694ba568
commit d7cb10d6d2
1 changed files with 17 additions and 14 deletions
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31
arch/powerpc/kernel/irq.c
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@ -301,6 +301,22 @@ static inline void handle_one_irq(unsigned int irq)
}
#endif
static inline void check_stack_overflow(void)
{
#ifdef CONFIG_DEBUG_STACKOVERFLOW
long sp;
sp = __get_SP() & (THREAD_SIZE-1);
/* check for stack overflow: is there less than 2KB free? */
if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
printk("do_IRQ: stack overflow: %ld\n",
sp - sizeof(struct thread_info));
dump_stack();
}
#endif
}
void do_IRQ(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
@ -308,20 +324,7 @@ void do_IRQ(struct pt_regs *regs)
irq_enter();
#ifdef CONFIG_DEBUG_STACKOVERFLOW
/* Debugging check for stack overflow: is there less than 2KB free? */
{
long sp;
sp = __get_SP() & (THREAD_SIZE-1);
if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
printk("do_IRQ: stack overflow: %ld\n",
sp - sizeof(struct thread_info));
dump_stack();
}
}
#endif
check_stack_overflow();
/*
* Every platform is required to implement ppc_md.get_irq.