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| author | David S. Miller <davem@davemloft.net> | 2010-04-14 02:04:29 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-14 02:04:29 -0700 |
| commit | ec687886de00e1e63f3d821ccade9a61590408ed (patch) | |
| tree | 093e303475754d30b679bd35ae9cc5522832057e /arch/sparc/kernel/kstack.h | |
| parent | 035df35d968323f6f463c8789553e8589efcbcd4 (diff) | |
| download | linux-ec687886de00e1e63f3d821ccade9a61590408ed.tar.bz2 | |
sparc64: Run NMIs on the hardirq stack.
Otherwise we can overflow the main stack with the function tracer
enabled.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/kstack.h')
| -rw-r--r-- | arch/sparc/kernel/kstack.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/sparc/kernel/kstack.h b/arch/sparc/kernel/kstack.h index 5247283d1c03..53dfb92e09fb 100644 --- a/arch/sparc/kernel/kstack.h +++ b/arch/sparc/kernel/kstack.h @@ -61,4 +61,23 @@ check_magic: } +static inline __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 inline __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp) +{ + __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp)); +} + #endif /* _KSTACK_H */ |