linux-kernel - Re: 2.6.26-rc5-mm3

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Message-Id: <1213811751.11203.73.camel@localhost.localdomain>
Date:	Wed, 18 Jun 2008 10:55:51 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Byron Bradley <byron.bbradley@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	linux-mm@...ck.org, Hua Zhong <hzhong@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.26-rc5-mm3


On Fri, 2008-06-13 at 00:32 +0100, Byron Bradley wrote:
> Looks like x86 and ARM both fail to boot if PROFILE_LIKELY, FTRACE and 
> DYNAMIC_FTRACE are selected. If any one of those three are disabled it 
> boots (or fails in some other way which I'm looking at now). The serial 
> console output from both machines when they fail to boot is below, let me 
> know if there is any other information I can provide.

I was able to reproduce a hang on x86 with those options. The patch
below is a potential fix. I think we don't want to trace
do_check_likely(), since the ftrace internals might use likely/unlikely
macro's which will just cause recursion back to do_check_likely()..

Signed-off-by: Daniel Walker <dwalker@...sta.com>

---
 lib/likely_prof.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.25/lib/likely_prof.c
===================================================================
--- linux-2.6.25.orig/lib/likely_prof.c
+++ linux-2.6.25/lib/likely_prof.c
@@ -22,7 +22,7 @@
 
 static struct likeliness *likeliness_head;
 
-int do_check_likely(struct likeliness *likeliness, unsigned int ret)
+int notrace do_check_likely(struct likeliness *likeliness, unsigned int ret)
 {
 	static unsigned long likely_lock;
 


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