[PATCH] perf record: fix link time error with sample_reg_masks on non x86

From: Stephane Eranian <eranian@google.com>
To: linux-kernel@vger.kernel.org
Cc: acme@redhat.com, peterz@infradead.org, mingo@elte.hu,
	ak@linux.intel.com, jolsa@redhat.com, namhyung@kernel.org,
	kan.liang@intel.com, dsahern@gmail.com, adrian.hunter@intel.com
Subject: [PATCH] perf record: fix link time error with sample_reg_masks on non x86
Date: Tue,  1 Sep 2015 11:30:14 +0200	[thread overview]
Message-ID: <1441099814-26783-1-git-send-email-eranian@google.com> (raw)

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>
---
 tools/perf/arch/x86/util/perf_regs.c | 44 +++++++++++++++++-------------------
 tools/perf/util/perf_regs.c          |  4 ++++
 tools/perf/util/perf_regs.h          |  2 ++
 3 files changed, 27 insertions(+), 23 deletions(-)

diff --git a/tools/perf/arch/x86/util/perf_regs.c b/tools/perf/arch/x86/util/perf_regs.c
index 087c84e..c5db14f 100644
--- a/tools/perf/arch/x86/util/perf_regs.c
+++ b/tools/perf/arch/x86/util/perf_regs.c
@@ -1,30 +1,28 @@
 #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
 };
diff --git a/tools/perf/util/perf_regs.c b/tools/perf/util/perf_regs.c
index 43168fb..885e8ac 100644
--- a/tools/perf/util/perf_regs.c
+++ b/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;
diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h
index 92c1fff..2984dcc 100644
--- a/tools/perf/util/perf_regs.h
+++ b/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[];
 
-- 
1.9.1

