[tip:perf/core] perf tools: Fix build break on powerpc due to sample_reg_masks

[tip-bot for Sukadev Bhattiprolu]

Commit-ID:  eb56db54326f910348defbee2803ec0675a664b2
Gitweb:     http://git.kernel.org/tip/eb56db54326f910348defbee2803ec0675a664b2
Author:     Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 24 Sep 2015 17:53:49 -0400
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 30 Sep 2015 18:34:27 -0300

perf tools: Fix build break on powerpc due to sample_reg_masks

The perf_regs.c file does not get built on Powerpc as CONFIG_PERF_REGS
is false.  So the weak definition for 'sample_regs_masks' doesn't get
picked up.

Adding perf_regs.o to util/Build unconditionally, exposes a redefinition
error for 'perf_reg_value()' function (due to the static inline version
in util/perf_regs.h). So use #ifdef HAVE_PERF_REGS_SUPPORT' around that
function.

Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx>
Cc: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxx
Link: http://lkml.kernel.org/r/20150930182836.GA27858@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/Build       | 2 +-
 tools/perf/util/perf_regs.c | 2 ++
 tools/perf/util/perf_regs.h | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 4bc7a9a..9217119 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -18,6 +18,7 @@ libperf-y += levenshtein.o
 libperf-y += llvm-utils.o
 libperf-y += parse-options.o
 libperf-y += parse-events.o
+libperf-y += perf_regs.o
 libperf-y += path.o
 libperf-y += rbtree.o
 libperf-y += bitmap.o
@@ -104,7 +105,6 @@ libperf-$(CONFIG_LIBBABELTRACE) += data-convert-bt.o
 
 libperf-y += scripting-engines/
 
-libperf-$(CONFIG_PERF_REGS) += perf_regs.o
 libperf-$(CONFIG_ZLIB) += zlib.o
 libperf-$(CONFIG_LZMA) += lzma.o
 
diff --git a/tools/perf/util/perf_regs.c b/tools/perf/util/perf_regs.c
index 885e8ac..6b8eb13 100644
--- a/tools/perf/util/perf_regs.c
+++ b/tools/perf/util/perf_regs.c
@@ -6,6 +6,7 @@ const struct sample_reg __weak sample_reg_masks[] = {
 	SMPL_REG_END
 };
 
+#ifdef HAVE_PERF_REGS_SUPPORT
 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
 {
 	int i, idx = 0;
@@ -29,3 +30,4 @@ out:
 	*valp = regs->cache_regs[id];
 	return 0;
 }
+#endif
diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h
index 2984dcc..679d6e4 100644
--- a/tools/perf/util/perf_regs.h
+++ b/tools/perf/util/perf_regs.h
@@ -2,6 +2,7 @@
 #define __PERF_REGS_H
 
 #include <linux/types.h>
+#include <linux/compiler.h>
 
 struct regs_dump;
 
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