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Date: Tue, 23 Sep 2014 09:26:23 -0700
From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
To: Aaro Koskinen <aaro.koskinen@iki.fi>
Subject: Re: [PATCH v5 1/1] powerpc/perf: Adjust callchain based on DWARF
 debug info
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Cc: Michael Ellerman <michaele@au1.ibm.com>, ulrich.weigand@de.ibm.com,
 Anton Blanchard <anton@au1.ibm.com>, linux-kernel@vger.kernel.org,
 Arnaldo Carvalho de Melo <acme@kernel.org>, linuxppc-dev@ozlabs.org,
 Maynard Johnson <mpjohn@us.ibm.com>, Jiri Olsa <jolsa@redhat.com>
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Aaro Koskinen [aaro.koskinen@iki.fi] wrote:
| Hi,
| 
| On Wed, Jun 25, 2014 at 08:49:03AM -0700, Sukadev Bhattiprolu wrote:
| > powerpc/perf: Adjust callchain based on DWARF debug info
| > 
| > When saving the callchain on Power, the kernel conservatively saves excess
| > entries in the callchain. A few of these entries are needed in some cases
| > but not others. We should use the DWARF debug information to determine
| > when the entries are  needed.
| 
| This patch breaks perf compilation if DWARF support is not present.
| DWARF support is auto-detected early in the build, so IMHO either user
| should be informed to install the needed stuff, or the build should
| succeed with limited functionality.
| 
| arch/powerpc/util/skip-callchain-idx.c:13:19: fatal error: dwarf.h: No such file or directory #include <dwarf.h>
|                    ^
| compilation terminated.

Yes. Sorry. Anton fixed this recently:

	https://lkml.org/lkml/2014/9/19/29

Sukadev