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Date: Tue, 23 Sep 2014 09:26:23 -0700 From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> To: Aaro Koskinen <aaro.koskinen@....fi> Cc: Jiri Olsa <jolsa@...hat.com>, Michael Ellerman <michaele@....ibm.com>, linuxppc-dev@...abs.org, Anton Blanchard <anton@....ibm.com>, linux-kernel@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...nel.org>, ulrich.weigand@...ibm.com, Maynard Johnson <mpjohn@...ibm.com> Subject: Re: [PATCH v5 1/1] powerpc/perf: Adjust callchain based on DWARF debug info Aaro Koskinen [aaro.koskinen@....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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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