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Date: Thu, 11 Feb 2016 20:35:28 +1100 From: Balbir Singh <bsingharora@...il.com> To: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> Cc: Torsten Duwe <duwe@....de>, Michael Ellerman <mpe@...erman.id.au>, Jiri Kosina <jkosina@...e.cz>, Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.com>, Jessica Yu <jeyu@...hat.com>, Steven Rostedt <rostedt@...dmis.org>, linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, live-patching@...r.kernel.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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