linux-kernel - Re: [PATCH 1/2] perf tools: Fix build on powerpc broken by pt/bts

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Date:	Wed, 26 Aug 2015 09:06:01 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	linux-kernel@...r.kernel.org,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/2] perf tools: Fix build on powerpc broken by pt/bts

On Tue, Aug 25, 2015 at 12:30:10PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Aug 25, 2015 at 01:42:27PM +0300, Adrian Hunter escreveu:
> > It is theoretically possible to process perf.data files created on
> > x86 and that contain Intel PT or Intel BTS data, on any other
> > architecture, which is why it is possible for there to be build
> > errors on powerpc caused by pt/bts.
> > 
> > The errors were:
> > 
> > 	util/intel-pt-decoder/intel-pt-insn-decoder.c: In function ‘intel_pt_insn_decoder’:
> > 	util/intel-pt-decoder/intel-pt-insn-decoder.c:138:3: error: switch missing default case [-Werror=switch-default]
> > 	   switch (insn->immediate.nbytes) {
> > 	   ^
> > 	cc1: all warnings being treated as errors
> > 
> > 	linux-acme.git/tools/perf/perf-obj/libperf.a(libperf-in.o): In function `intel_pt_synth_branch_sample':
> > 	sources/linux-acme.git/tools/perf/util/intel-pt.c:871: undefined reference to `tsc_to_perf_time'
> > 	linux-acme.git/tools/perf/perf-obj/libperf.a(libperf-in.o): In function `intel_pt_sample':
> > 	sources/linux-acme.git/tools/perf/util/intel-pt.c:915: undefined reference to `tsc_to_perf_time'
> > 	sources/linux-acme.git/tools/perf/util/intel-pt.c:962: undefined reference to `tsc_to_perf_time'
> > 	linux-acme.git/tools/perf/perf-obj/libperf.a(libperf-in.o): In function `intel_pt_process_event':
> > 	sources/linux-acme.git/tools/perf/util/intel-pt.c:1454: undefined reference to `perf_time_to_tsc'
> > 
> > Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> > ---
> >  tools/perf/util/Build                                    | 2 +-
> >  tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c | 3 +++
> >  2 files changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> > index e912856cc4e5..8ae31e5131ee 100644
> > --- a/tools/perf/util/Build
> > +++ b/tools/perf/util/Build
> > @@ -74,7 +74,7 @@ libperf-y += stat-shadow.o
> >  libperf-y += record.o
> >  libperf-y += srcline.o
> >  libperf-y += data.o
> > -libperf-$(CONFIG_X86) += tsc.o
> > +libperf-$(if $(CONFIG_X86)$(CONFIG_AUXTRACE),y) += tsc.o
> 
> I think this is preferred/more clear:
> 
> libperf-$(CONFIG_X86) += tsc.o
> libperf-$(CONFIG_AUXTRACE) += tsc.o
> 
> As we have in drivers/Makefile, in the kernel sources:
> 
> drivers/Makefile:obj-$(CONFIG_PCI)		+= usb/
> drivers/Makefile:obj-$(CONFIG_USB_GADGET)	+= usb/
> drivers/Makefile:obj-$(CONFIG_USB_PHY)		+= usb/
> drivers/Makefile:obj-$(CONFIG_USB)		+= usb/
> 
> From Documentation/kbuild/makefiles.txt:
> 
> --- 3.2 Built-in object goals - obj-y
> 
>         The kbuild Makefile specifies object files for vmlinux
>         in the $(obj-y) lists.  These lists depend on the kernel
>         configuration.
> 
>         Kbuild compiles all the $(obj-y) files.  It then calls
>         "$(LD) -r" to merge these files into one built-in.o file.
>         built-in.o is later linked into vmlinux by the parent Makefile.
> 
>         The order of files in $(obj-y) is significant.  Duplicates in
>         the lists are allowed: the first instance will be linked into
>         built-in.o and succeeding instances will be ignored.

nope, we don't do that.. but it's nice feature ;-)
seems easy enough, I'll check

jirka
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