perf tools: Fix link time error with sample_reg_masks on non x86

This patch makes perf compile on non x86 platforms by defining a weak
symbol for sample_reg_masks[] in util/perf_regs.c.

The patch also moves the REG() and REG_END() macros into the
util/per_regs.h header file. The macros are renamed to
SMPL_REG/SMPL_REG_END to avoid clashes with other header files.
Signed-off-by: Stephane Eranian <eranian@google.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1441099814-26783-1-git-send-email-eranian@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/util/perf_regs.c

 #include "../../perf.h"
 #include "../../util/perf_regs.h"
 
-#define REG(n, b) { .name = #n, .mask = 1ULL << (b) }
-#define REG_END { .name = NULL }
 const struct sample_reg sample_reg_masks[] = {
-	REG(AX, PERF_REG_X86_AX),
-	REG(BX, PERF_REG_X86_BX),
-	REG(CX, PERF_REG_X86_CX),
-	REG(DX, PERF_REG_X86_DX),
-	REG(SI, PERF_REG_X86_SI),
-	REG(DI, PERF_REG_X86_DI),
-	REG(BP, PERF_REG_X86_BP),
-	REG(SP, PERF_REG_X86_SP),
-	REG(IP, PERF_REG_X86_IP),
-	REG(FLAGS, PERF_REG_X86_FLAGS),
-	REG(CS, PERF_REG_X86_CS),
-	REG(SS, PERF_REG_X86_SS),
+	SMPL_REG(AX, PERF_REG_X86_AX),
+	SMPL_REG(BX, PERF_REG_X86_BX),
+	SMPL_REG(CX, PERF_REG_X86_CX),
+	SMPL_REG(DX, PERF_REG_X86_DX),
+	SMPL_REG(SI, PERF_REG_X86_SI),
+	SMPL_REG(DI, PERF_REG_X86_DI),
+	SMPL_REG(BP, PERF_REG_X86_BP),
+	SMPL_REG(SP, PERF_REG_X86_SP),
+	SMPL_REG(IP, PERF_REG_X86_IP),
+	SMPL_REG(FLAGS, PERF_REG_X86_FLAGS),
+	SMPL_REG(CS, PERF_REG_X86_CS),
+	SMPL_REG(SS, PERF_REG_X86_SS),
 #ifdef HAVE_ARCH_X86_64_SUPPORT
-	REG(R8, PERF_REG_X86_R8),
-	REG(R9, PERF_REG_X86_R9),
-	REG(R10, PERF_REG_X86_R10),
-	REG(R11, PERF_REG_X86_R11),
-	REG(R12, PERF_REG_X86_R12),
-	REG(R13, PERF_REG_X86_R13),
-	REG(R14, PERF_REG_X86_R14),
-	REG(R15, PERF_REG_X86_R15),
+	SMPL_REG(R8, PERF_REG_X86_R8),
+	SMPL_REG(R9, PERF_REG_X86_R9),
+	SMPL_REG(R10, PERF_REG_X86_R10),
+	SMPL_REG(R11, PERF_REG_X86_R11),
+	SMPL_REG(R12, PERF_REG_X86_R12),
+	SMPL_REG(R13, PERF_REG_X86_R13),
+	SMPL_REG(R14, PERF_REG_X86_R14),
+	SMPL_REG(R15, PERF_REG_X86_R15),
 #endif
-	REG_END
+	SMPL_REG_END
 };

tools/perf/util/perf_regs.c

@@ -2,6 +2,10 @@
 #include "perf_regs.h"
 #include "event.h"
 
+const struct sample_reg __weak sample_reg_masks[] = {
+	SMPL_REG_END
+};
+
 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
 {
 	int i, idx = 0;

tools/perf/util/perf_regs.h

@@ -9,6 +9,8 @@ struct sample_reg {
 	const char *name;
 	uint64_t mask;
 };
+#define SMPL_REG(n, b) { .name = #n, .mask = 1ULL << (b) }
+#define SMPL_REG_END { .name = NULL }
 
 extern const struct sample_reg sample_reg_masks[];