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

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Date:	Thu, 05 Jan 2012 06:46:51 -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 Thu, 2012-01-05 at 10:19 +0100, Ingo Molnar wrote:
> * Steven Rostedt <rostedt@...dmis.org> wrote:

> > I actually haven't looked at the NMI branch yet. I'm still 
> > trying to figure out why the ftrace one would lockup. I'll try 
> > another box to see if that one also locks up on tip/master 
> > with your config.
> 
> Any update on this?

No, for some reason my other box doesn't want to boot your config (no
root found). But I noticed that my first box fails on tip/master with
just my min-config. I ran the bisect and hit this as the bad commit:


commit 41e95d95208c62d4b0fbcee5f16d93e23ca32984
Author: Ingo Molnar <mingo@...e.hu>
Date:   Thu Sep 17 23:12:20 2009 +0200

    <not-for-merge> Disable DEVTMPFS_MOUNT for now
    
    Causing bootup problems - /dev/zero and /dev/null not being there, etc.
    
    NOT-Signed-off-by: Ingo Molnar <mingo@...e.hu>

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index ee37727..c52aaad 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -28,6 +28,7 @@ config DEVTMPFS
 config DEVTMPFS_MOUNT
        bool "Automount devtmpfs at /dev"
        depends on DEVTMPFS
+       depends on 0
        help
          This will mount devtmpfs at /dev if the kernel mounts the root
          filesystem. It will not affect initramfs based mounting.


When I reverted this, my machine booted. I'm now trying that machine
again with your allyesconfig.

Is there other strange things in tip/master that I should be aware
about?

Again, do you see these errors when just booting my branch directly?
(not merging the branch into another branch).


> 
> 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.

Thanks,

-- Steve


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