linux-kernel - Re: [PATCH 5/5 v3] ftrace/x86-32: Add -mfentry support to x86_32 with DYNAMIC

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Date:   Thu, 16 Mar 2017 17:25:35 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...capital.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 5/5 v3] ftrace/x86-32: Add -mfentry support to x86_32
 with DYNAMIC_FTRACE set

On Thu, 16 Mar 2017 16:00:43 -0500
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> On Thu, Mar 16, 2017 at 04:40:36PM -0400, Steven Rostedt wrote:
> > [
> >   Fengguang Wu's bot told me that it failed to compile, as ftrace_32.S
> >   always gets compiled (as does ftrace_64.S). And the content needs to
> >   be protected within the #ifdef.
> > ]  
> 
> Why not instead make their compilation conditional in the Makefile?
> 
> Like:
> 
> obj-$(CONFIG_FUNCTION_TRACER)	+= ftrace_$(bits).o
> 

That's another patch ;-)

I just followed suit with what was already there.

I'll add a 6th patch to clean that up.

-- Steve