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Date: Fri, 8 Jan 2010 12:45:25 +0800 From: Li Yi <yi.li@...log.com> To: rostedt@...dmis.org, linux-kernel@...r.kernel.org CC: uclinux-dist-devel@...ckfin.uclinux.org Subject: [PATCH] Ftrace: irqsoff tracer may cause stack overflow "irqsoff" tracer may cause stack overflow on architectures using asm-generic/atomic.h, due to recursive invoking of, e.g. trace_hardirqs_off(). trace_hardirqs_off() -> start_critical_timing() -> atomic_inc() -> atomic_add_return() -> local_irq_save() -> trace_hardirqs_off() Signed-off-by: Yi Li <yi.li@...log.com> --- include/asm-generic/atomic.h | 12 ++++++------ 1 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h index c99c64d..c3e5f4b 100644 --- a/include/asm-generic/atomic.h +++ b/include/asm-generic/atomic.h @@ -60,11 +60,11 @@ static inline int atomic_add_return(int i, atomic_t *v) unsigned long flags; int temp; - local_irq_save(flags); + raw_local_irq_save(flags); temp = v->counter; temp += i; v->counter = temp; - local_irq_restore(flags); + raw_local_irq_restore(flags); return temp; } @@ -82,11 +82,11 @@ static inline int atomic_sub_return(int i, atomic_t *v) unsigned long flags; int temp; - local_irq_save(flags); + raw_local_irq_save(flags); temp = v->counter; temp -= i; v->counter = temp; - local_irq_restore(flags); + raw_local_irq_restore(flags); return temp; } @@ -139,9 +139,9 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr) unsigned long flags; mask = ~mask; - local_irq_save(flags); + raw_local_irq_save(flags); *addr &= mask; - local_irq_restore(flags); + raw_local_irq_restore(flags); } #define atomic_xchg(ptr, v) (xchg(&(ptr)->counter, (v))) -- 1.6.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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