[PATCH v5 1/1] powerpc/perf: Adjust callchain based on DWARF debug info

[Aaro Koskinen]

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.

A.