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sparc64: Run NMIs on the hardirq stack.

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Otherwise we can overflow the main stack with the function tracer
enabled.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2010-04-14 02:04:29 -07:00
parent 035df35d96
commit ec687886de
3 changed files with 27 additions and 18 deletions
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19
arch/sparc/kernel/irq_64.c
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@@ -47,6 +47,7 @@
#include "entry.h"
#include "cpumap.h"
#include "kstack.h"
#define NUM_IVECS (IMAP_INR + 1)
@@ -713,24 +714,6 @@ void ack_bad_irq(unsigned int virt_irq)
void *hardirq_stack[NR_CPUS];
void *softirq_stack[NR_CPUS];
static __attribute__((always_inline)) void *set_hardirq_stack(void)
{
void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
__asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
if (orig_sp < sp ||
orig_sp > (sp + THREAD_SIZE)) {
sp += THREAD_SIZE - 192 - STACK_BIAS;
__asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
}
return orig_sp;
}
static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
{
__asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
}
void __irq_entry handler_irq(int irq, struct pt_regs *regs)
{
unsigned long pstate, bucket_pa;