linux-kernel - Re: [PATCH 00/16] [GIT PULL] tracing: fixes/cleanups, no stop-machine, update stack tracer

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Date:	Sat, 07 Jan 2012 17:32:01 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 00/16] [GIT PULL] tracing: fixes/cleanups, no
 stop-machine, update stack tracer

On Sat, 2012-01-07 at 13:25 +0100, Ingo Molnar wrote:
> * Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > > I'm also seeing build failures with certain configs:
> > > 
> > > kernel/trace/trace_stack.c:387:3: error: implicit declaration of function ‘ftrace_set_early_filter’ 
> > > [-Werror=implicit-function-declaration]
> > 
> > Hmm, your right. It depends on dyn_ftrace to be configured. 
> > Strange that my tests didn't catch that as I thought one of my 
> > tests compiles with static ftrace. I'll have to look into why 
> > my test didn't catch that. I'll send a fix later today.
> 
> Hm, i cannot re-test this tree with general randconfig until it 
> keeps failing the build. I'll test the NMI bits, to be able to 
> exclude those.


Ingo,

I updated the branch by adding the below patch that fixes the bug. You
can apply this and then run your tests again.

Thanks!

Please pull the latest tip/perf/core tree, which can be found at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
tip/perf/core

Head SHA1: 96de37b62ca525cd77d2e85aea1472846ee31c4d


Steven Rostedt (1):
      tracing: Fix compile error when static ftrace is enabled

----
 include/linux/ftrace.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---------------------------
commit 96de37b62ca525cd77d2e85aea1472846ee31c4d
Author: Steven Rostedt <srostedt@...hat.com>
Date:   Sat Jan 7 17:26:49 2012 -0500

    tracing: Fix compile error when static ftrace is enabled
    
    The stack tracer uses the call ftrace_set_early_filter() function
    to allow the stack tracer to pick its own functions on boot.
    But this function is not defined if dynamic ftrace is not set.
    This causes a compiler error when stack tracer is enabled and
    dynamic ftrace is not.
    
    Reported-by: Ingo Molnar <mingo@...e.hu>
    Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 41df6f5..028e26f 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -339,6 +339,7 @@ static inline int ftrace_text_reserved(void *start, void *end)
  * functions may still be called. Use a macro instead of inline.
  */
 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
+#define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
 
 static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
 			    size_t cnt, loff_t *ppos) { return -ENODEV; }


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