linux-kernel - Re: [PATCH v8 4/8] ppc64 ftrace_with

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Message-ID: <20160211130053.5955729.20187.27391@alphion.com>
Date:	Thu, 11 Feb 2016 13:00:53 +0000
From:	Murali Sampath <MSampath@...hion.com>
To:	Balbir Singh <bsingharora@...il.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
CC:	Petr Mladek <pmladek@...e.com>, Jessica Yu <jeyu@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Torsten Duwe <duwe@....de>, Jiri Kosina <jkosina@...e.cz>,
	"live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
	Miroslav Benes <mbenes@...e.cz>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v8 4/8] ppc64 ftrace_with_regs configuration variables

‎ t

  Original Message
From: Balbir Singh
Sent: Thursday, February 11, 2016 4:37 AM
To: Kamalesh Babulal
Cc: Petr Mladek; Jessica Yu; linux-kernel@...r.kernel.org; Steven Rostedt; Torsten Duwe; Jiri Kosina; live-patching@...r.kernel.org; Miroslav Benes; linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v8 4/8] ppc64 ftrace_with_regs configuration variables


On Thu, 2016-02-11 at 14:09 +0530, Kamalesh Babulal wrote:
> * Balbir Singh <bsingharora@...il.com> [2016-02-11 18:48:17]:
>
> > On Wed, 2016-02-10 at 17:25 +0100, Torsten Duwe wrote:
> >
> > snip
> >
> > > diff --git a/arch/powerpc/gcc-mprofile-kernel-notrace.sh
> > > b/arch/powerpc/gcc-mprofile-kernel-notrace.sh
> > > new file mode 100755
> > > index 0000000..68d6482
> > > --- /dev/null
> > > +++ b/arch/powerpc/gcc-mprofile-kernel-notrace.sh
> > > @@ -0,0 +1,33 @@
> > > +#!/bin/sh
> > > +# Test whether the compile option -mprofile-kernel
> > > +# generates profiling code ( = a call to mcount), and
> > > +# whether a function without any global references sets
> > > +# the TOC pointer properly at the beginning, and
> > > +# whether the "notrace" function attribute successfully
> > > +# suppresses the _mcount call.
> > > +
> > > +echo "int func() { return 0; }" | \
> > > +    $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \
> > > +    grep -q "mcount"
> > > +
> > > +trace_result=$?
> > > +
> > > +echo "int func() { return 0; }" | \
> > > +    $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \
> > > +    sed -n -e '/func:/,/bl _mcount/p' | grep -q TOC
> > > +
> > > +leaf_toc_result=$?
> > > +
> >
> > leaf_toc_result failed for me with gcc 5. I'll try and grab gcc-6
> > and give the patches a spin
> >
>
> It fails for me to on ppc64le but pass over ppc64
>

This series is for ppc64le only, so we can safely ignore ppc64 for now

Regards,
Balbir Singh.
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