Commit d7cb10d6 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
Browse files

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



Makes do_IRQ() shorter and clearer.

Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent f2694ba5

arch/powerpc/kernel/irq.c

+17 −14
Original line number Diff line number Diff line
@@ -301,27 +301,30 @@ static inline void handle_one_irq(unsigned int irq) 
}

#endif



void do_IRQ(struct pt_regs *regs)

static inline void check_stack_overflow(void)

{

	struct pt_regs *old_regs = set_irq_regs(regs);

	unsigned int irq;



	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);



	/* 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);

	unsigned int irq;



	irq_enter();



	check_stack_overflow();



	/*

	 * Every platform is required to implement ppc_md.get_irq.