linux-kernel - Re: [PATCH v6 10/11] perf callchain: Support x86 target platform

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Message-ID: <20160530093034.GA9298@krava>
Date:	Mon, 30 May 2016 11:30:34 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Hekuang <hekuang@...wei.com>
Cc:	peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
	alexander.shishkin@...ux.intel.com, wangnan0@...wei.com,
	jpoimboe@...hat.com, ak@...ux.intel.com, eranian@...gle.com,
	namhyung@...nel.org, adrian.hunter@...el.com,
	sukadev@...ux.vnet.ibm.com, masami.hiramatsu.pt@...achi.com,
	tumanova@...ux.vnet.ibm.com, kan.liang@...el.com,
	penberg@...nel.org, dsahern@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 10/11] perf callchain: Support x86 target platform

On Mon, May 30, 2016 at 05:11:35PM +0800, Hekuang wrote:
> hi
> 
> 在 2016/5/30 16:53, Jiri Olsa 写道:
> > On Sat, May 28, 2016 at 11:59:59AM +0000, He Kuang wrote:
> > > Support x86(32-bit) cross platform callchain unwind.
> > > 
> > > Signed-off-by: He Kuang <hekuang@...wei.com>
> > > ---
> > >   tools/perf/arch/Build                              |  1 +
> > >   tools/perf/arch/x86/util/unwind-libunwind.c        |  7 ++++---
> > >   tools/perf/arch/x86/util/unwind-libunwind_x86_32.c | 21 +++++++++++++++++++++
> > >   tools/perf/util/unwind-libunwind-local.c           |  4 ++++
> > >   tools/perf/util/unwind-libunwind.c                 | 19 +++++++++++++------
> > >   tools/perf/util/unwind.h                           | 10 ++++++++++
> > >   6 files changed, 53 insertions(+), 9 deletions(-)
> > >   create mode 100644 tools/perf/arch/x86/util/unwind-libunwind_x86_32.c
> > > 
> > > diff --git a/tools/perf/arch/Build b/tools/perf/arch/Build
> > > index 109eb75..3fc4af1 100644
> > > --- a/tools/perf/arch/Build
> > > +++ b/tools/perf/arch/Build
> > > @@ -1,2 +1,3 @@
> > >   libperf-y += common.o
> > >   libperf-y += $(ARCH)/
> > > +libperf-$(CONFIG_LIBUNWIND_X86)      += x86/util/unwind-libunwind_x86_32.o
> > we have Build file directly in arch/x86/util/
> > 
> > if you do it like this to include generic file easily
> > we better fix the include then
> 
> This is because "libperf-y += $(ARCH)" will only sink into $(ARCH) folder,
> for example on x86_64, only tools/perf/arch/x86 will be built. But for
>  remote libunwind, we also need
>  'tools/perf/arch/arm64/util/unwind-libunwind.o', while arm64 folder is
> not added to libperf-y. Is there a gracefull to deal with this?

you just need to include the file, right?

I think it's ok to include arch/arm/....c
from arch/x86/util/unwind-libunwind-arm64.c

jirka