linux-kernel - Re: [PATCH] perf: Only include tsc file for x86

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Date:	Fri, 20 Feb 2015 10:36:00 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Jiri Olsa <jolsa@...hat.com>, David Ahern <david.ahern@...cle.com>
CC:	acme@...nel.org, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] perf: Only include tsc file for x86

On 19/02/15 21:42, Jiri Olsa wrote:
> On Thu, Feb 19, 2015 at 01:22:33PM -0500, David Ahern wrote:
>> perf_time_to_tsc and tsc_to_perf_time are only used for x86. Make
>> inclusion of tsc.c dependent on x86 as well.
> 
> hum, should we move it to arch/x86/util/tsc.c and remove util/tsc.c?

It is not arch-specific because you can read a perf.data file
from one architecture on another architecture.

The TSC stuff was planned for Intel PT although it might now
be done differently.

Probably you should have CONFIG_X86_TSC and then select that
with CONFIG_X86. Later it can be selected with CONFIG_INTEL_PT
as well.

> 
> looks like it's used only by test tsc code, which is enabled
> for x86 only anyway..
> 
> jirka
> 
>>
>> Signed-off-by: David Ahern <david.ahern@...cle.com>
>> Cc: Adrian Hunter <adrian.hunter@...el.com>
>> Cc: Jiri Olsa <jolsa@...nel.org>
>> ---
>>  tools/perf/util/Build | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
>> index 32f9327b1a97..4c7095785ba0 100644
>> --- a/tools/perf/util/Build
>> +++ b/tools/perf/util/Build
>> @@ -71,7 +71,7 @@ libperf-y += stat.o
>>  libperf-y += record.o
>>  libperf-y += srcline.o
>>  libperf-y += data.o
>> -libperf-y += tsc.o
>> +libperf-$(CONFIG_X86) += tsc.o
>>  libperf-y += cloexec.o
>>  libperf-y += thread-stack.o
>>  
>> -- 
>> 1.9.3
>>
> 
> 

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