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

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Date:	Fri, 8 Jan 2010 01:26:00 -0500
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Li Yi <yi.li@...log.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 Fri, Jan 8, 2010 at 01:26, Li Yi wrote:
> 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 ?
>
> 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().

well now you have the opposite problem ... your changelog needs to be
line wrapped
-mike
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