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 09:57:13 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
CC:	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 25/08/15 18:30, 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

I tried that first but it doesn't work:

util/tsc.o: In function `perf_time_to_tsc':
/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/tsc.c:7: multiple definition of `perf_time_to_tsc'
util/tsc.o:/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/tsc.c:7: first defined here
util/tsc.o: In function `tsc_to_perf_time':
/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/tsc.c:18: multiple definition of `tsc_to_perf_time'
util/tsc.o:/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/tsc.c:18: first defined here
make[3]: *** [util/libperf-in.o] Error 1
make[2]: *** [util] Error 2
make[1]: *** [libperf-in.o] Error 2
make: *** [all] Error 2

I will have a look at why, unless Jiri knows?

> 
> 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 $(obj-y) is significant.  Duplicates in
>         the lists are allowed: the first instance will be linked into
>         built-in.o and succeeding instances will be ignored.
> 
> ------------------------
> 
> Jiri?
> 
> - Arnaldo
> 
>>  libperf-y += cloexec.o
>>  libperf-y += thread-stack.o
>>  libperf-$(CONFIG_AUXTRACE) += auxtrace.o
>> diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
>> index 9e4eb8fcd559..d23138c06665 100644
>> --- a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
>> +++ b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
>> @@ -146,6 +146,9 @@ static void intel_pt_insn_decoder(struct insn *insn,
>>  		case 4:
>>  			intel_pt_insn->rel = bswap_32(insn->immediate.value);
>>  			break;
>> +		default:
>> +			intel_pt_insn->rel = 0;
>> +			break;
>>  		}
>>  #else
>>  		intel_pt_insn->rel = insn->immediate.value;
>> -- 
>> 1.9.1
> 
> 

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