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| author | Mike Frysinger <vapier@gentoo.org> | 2009-06-15 06:18:38 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-06-22 21:15:43 -0400 |
| commit | 6f10fdabdce356aac3c948e659f39b6f1e2f7382 (patch) | |
| tree | ab34b944e187609a2712883bfec6a9d5a5690762 /arch/blackfin | |
| parent | 46f288a0f983401ebadb918751d342cbf819cde5 (diff) | |
| download | lwn-6f10fdabdce356aac3c948e659f39b6f1e2f7382.tar.gz lwn-6f10fdabdce356aac3c948e659f39b6f1e2f7382.zip | |
Blackfin: simplify irq stack overflow checking
Take a page from x86 and abstract the stack checking out of the
asm_do_IRQ() function so that the result is easier to digest.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/kernel/irqchip.c | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/arch/blackfin/kernel/irqchip.c b/arch/blackfin/kernel/irqchip.c index 8abb642283b4..7378440792a4 100644 --- a/arch/blackfin/kernel/irqchip.c +++ b/arch/blackfin/kernel/irqchip.c @@ -88,6 +88,22 @@ int show_interrupts(struct seq_file *p, void *v) } #endif +#ifdef CONFIG_DEBUG_STACKOVERFLOW +static void check_stack_overflow(int irq) +{ + /* Debugging check for stack overflow: is there less than STACK_WARN free? */ + long sp = __get_SP() & (THREAD_SIZE - 1); + + if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { + dump_stack(); + pr_emerg("irq%i: possible stack overflow only %ld bytes free\n", + irq, sp - sizeof(struct thread_info)); + } +} +#else +static inline void check_stack_overflow(int irq) { } +#endif + /* * do_IRQ handles all hardware IRQs. Decoded IRQs should not * come via this function. Instead, they should provide their @@ -105,21 +121,7 @@ asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs) irq_enter(); -#ifdef CONFIG_DEBUG_STACKOVERFLOW - /* Debugging check for stack overflow: is there less than STACK_WARN free? */ - { - long sp; - - sp = __get_SP() & (THREAD_SIZE-1); - - if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { - dump_stack(); - printk(KERN_EMERG "%s: possible stack overflow while handling irq %i " - " only %ld bytes free\n", - __func__, irq, sp - sizeof(struct thread_info)); - } - } -#endif + check_stack_overflow(irq); /* * Some hardware gives randomly wrong interrupts. Rather |