linux-kernel - Re: ftraced and suspend to ram

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Message-ID: <20080822103533.GA5425@joi>
Date:	Fri, 22 Aug 2008 12:35:39 +0200
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Pavel Machek <pavel@...e.cz>
Cc:	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: ftraced and suspend to ram

On Fri, Aug 22, 2008 at 09:23:43AM +0200, Pavel Machek wrote:
> > 
> > * Rafael J. Wysocki <rjw@...k.pl> wrote:
> > 
> > > > > The code in question is the ftraced() function in 
> > > > > kernel/trace/ftrace.c
> > > > 
> > > > Thanks, I'll have a look in a while.
> > > 
> > > Can you try the appended patch, please?
> > 
> > makes sense - i've applied it to tip/tracing/urgent, see the tidied up 
> > commit below.
> > 
> > It should be no big issue not being able to trace across suspend+resume 
> > - and that restriction will go away with Steve's build-time based mcount 
> > patching mechanism in v2.6.28.
> 
> Patch looks okay to me, but I'm not sure if another issue is not
> hiding under it. Did anyone actually test ftrace + suspend after
> applying this?

I just tested this patch - it didn't help ;(

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 49f4c3f..02e41b2 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -27,6 +27,7 @@
 #include <linux/ctype.h>
 #include <linux/hash.h>
 #include <linux/list.h>
+#include <linux/freezer.h>
 
 #include <asm/ftrace.h>
 
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