linux-kernel - Re: [RFA][PATCH 20/27] parisc: ftrace: Remove check of obsolete variable function_trace

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Date:	Sun, 29 Jun 2014 23:20:23 +0200
From:	Helge Deller <deller@....de>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [RFA][PATCH 20/27] parisc: ftrace: Remove check of obsolete variable
 function_trace_stop

Hi Steven,

On 06/26/2014 07:35 PM, Steven Rostedt wrote:
> On Thu, 26 Jun 2014 12:52:41 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
>> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
>>
>> Nothing sets function_trace_stop to disable function tracing anymore.
>> Remove the check for it in the arch code.
> 
> From the cover letter, you were not Cc'd on.
> 
> Anyway, as there is no more reason to set function_trace_stop it is time
> to remove it. Unfortunately it's in several archs in assembly. Most of
> the assembly looks rather straight forward and I removed them myself.
> But I was only able to compile test them (for archs: arm64, metag, and
> microblaze I do not have my cross tools set up for them and did not
> even compile test it). But I would really love it if people can
> download their patch and test it out. You only need the patches that go
> against your arch and to really test it, also include the patch titled: 
> 
>  ftrace: Remove check for HAVE_FUNCTION_TRACE_MCOUNT_TEST
> 
> Otherwise your arch patch will call the list op that still does the
> check. That is, if you want to test suspend and resume on your arch.
> 
> As you may see, there are patches to the ftrace infrastructure that
> depend on the arch patches being implemented. I removed the
> functionality from the infrastructure, then removed it from the archs,
> and then finally removed the existence of the function_trace_stop
> variable, which would cause the archs to fail to compile if that were
> to go first.
> 
> If you can test your arch and give me your acked-by, I would appreciate
> it. Otherwise, if you need this to go through your tree, I would ask you
> to set up a dedicated branch that I can pull from to keep this order
> intact.

Sadly the arch-related tracing code in parisc is really broken.
It doesn't even compile cleanly on parisc (at least on 64bit), and as I wrote you in another mail
I really need to fix this soon (which I already started on).

But your patches look clean, so to get the basics right, I'm happy to give a 
Acked-by: Helge Deller <deller@....de>
for the two patches which affect parisc, which are:
[PATCH 08/27] parisc: ftrace: Add call to ftrace_graph_is_dead() in function graph code
[PATCH 20/27] parisc: ftrace: Remove check of obsolete variable function_trace_stop

It would be good if you can push them through your tree.
I assume your tree is: 
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
with branch ftrace/next. 
Is this correct?
If yes, I can build my patches upon this tree...

Thanks!
Helge

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