linux-kernel - Re: [PATCH] Ftrace: irqsoff tracer may cause stack overflow

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Date:	Fri, 8 Jan 2010 14:26:11 +0800
From:	Li Yi <yi.li@...log.com>
To:	Mike Frysinger <vapier.adi@...il.com>
CC:	Arnd Bergmann <arnd@...db.de>, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH] Ftrace: irqsoff tracer may cause stack overflow

On Thu, 2010-01-07 at 23:54 -0500, Mike Frysinger wrote:
> > @@ -60,11 +60,11 @@ static inline int atomic_add_return(int i, atomic_t
> > *v)
> > @@ -82,11 +82,11 @@ static inline int atomic_sub_return(int i, atomic_t
> > *v)
> > @@ -139,9 +139,9 @@ static inline void atomic_clear_mask(unsigned long
> > mask, unsigned long *addr)
> 
> looks like your mailer has line wrapping problems ... might want to
> fix that.  maybe just find a smtp server in ADI shanghai's office to
> send to and use sendemail.smtpersver in your ~/.gitconfig ?
> -mike
> 

Thanks. Disabled auto-wrap and resend:

"irqsoff" tracer may cause stack overflow on architectures using asm-generic/atomic.h, due to recursive invoking of 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


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