perf tools: Make CPUINFO_PROC an array to support different kernel versions

After kernel 3.7 (commit b4b8f770),
/proc/cpuinfo replaces 'Processor' to 'model name'.

This patch makes CPUINFO_PROC to an array and provides two choices for
ARM, makes it compatible for different kernel version.

v1 -> v2: minor changes as suggested by Namhyung Kim:

 - Doesn't pass @h and @evlist to __write_cpudesc;
 - Coding style fix.

v2 -> v3:
  - Rebase:
    git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/core
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1414115126-7479-1-git-send-email-wangnan0@huawei.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/perf-sys.h

@@ -13,7 +13,7 @@
 #define wmb()		asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
 #define rmb()		asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
 #define cpu_relax()	asm volatile("rep; nop" ::: "memory");
-#define CPUINFO_PROC	"model name"
+#define CPUINFO_PROC	{"model name"}
 #ifndef __NR_perf_event_open
 # define __NR_perf_event_open 336
 #endif
@@ -30,7 +30,7 @@
 #define wmb()		asm volatile("sfence" ::: "memory")
 #define rmb()		asm volatile("lfence" ::: "memory")
 #define cpu_relax()	asm volatile("rep; nop" ::: "memory");
-#define CPUINFO_PROC	"model name"
+#define CPUINFO_PROC	{"model name"}
 #ifndef __NR_perf_event_open
 # define __NR_perf_event_open 298
 #endif
@@ -47,14 +47,14 @@
 #define mb()		asm volatile ("sync" ::: "memory")
 #define wmb()		asm volatile ("sync" ::: "memory")
 #define rmb()		asm volatile ("sync" ::: "memory")
-#define CPUINFO_PROC	"cpu"
+#define CPUINFO_PROC	{"cpu"}
 #endif
 
 #ifdef __s390__
 #define mb()		asm volatile("bcr 15,0" ::: "memory")
 #define wmb()		asm volatile("bcr 15,0" ::: "memory")
 #define rmb()		asm volatile("bcr 15,0" ::: "memory")
-#define CPUINFO_PROC	"vendor_id"
+#define CPUINFO_PROC	{"vendor_id"}
 #endif
 
 #ifdef __sh__
@@ -67,14 +67,14 @@
 # define wmb()		asm volatile("" ::: "memory")
 # define rmb()		asm volatile("" ::: "memory")
 #endif
-#define CPUINFO_PROC	"cpu type"
+#define CPUINFO_PROC	{"cpu type"}
 #endif
 
 #ifdef __hppa__
 #define mb()		asm volatile("" ::: "memory")
 #define wmb()		asm volatile("" ::: "memory")
 #define rmb()		asm volatile("" ::: "memory")
-#define CPUINFO_PROC	"cpu"
+#define CPUINFO_PROC	{"cpu"}
 #endif
 
 #ifdef __sparc__
@@ -87,14 +87,14 @@
 #endif
 #define wmb()		asm volatile("":::"memory")
 #define rmb()		asm volatile("":::"memory")
-#define CPUINFO_PROC	"cpu"
+#define CPUINFO_PROC	{"cpu"}
 #endif
 
 #ifdef __alpha__
 #define mb()		asm volatile("mb" ::: "memory")
 #define wmb()		asm volatile("wmb" ::: "memory")
 #define rmb()		asm volatile("mb" ::: "memory")
-#define CPUINFO_PROC	"cpu model"
+#define CPUINFO_PROC	{"cpu model"}
 #endif
 
 #ifdef __ia64__
@@ -102,7 +102,7 @@
 #define wmb()		asm volatile ("mf" ::: "memory")
 #define rmb()		asm volatile ("mf" ::: "memory")
 #define cpu_relax()	asm volatile ("hint @pause" ::: "memory")
-#define CPUINFO_PROC	"model name"
+#define CPUINFO_PROC	{"model name"}
 #endif
 
 #ifdef __arm__
@@ -113,7 +113,7 @@
 #define mb()		((void(*)(void))0xffff0fa0)()
 #define wmb()		((void(*)(void))0xffff0fa0)()
 #define rmb()		((void(*)(void))0xffff0fa0)()
-#define CPUINFO_PROC	"Processor"
+#define CPUINFO_PROC	{"model name", "Processor"}
 #endif
 
 #ifdef __aarch64__
@@ -133,28 +133,28 @@
 				: "memory")
 #define wmb()	mb()
 #define rmb()	mb()
-#define CPUINFO_PROC	"cpu model"
+#define CPUINFO_PROC	{"cpu model"}
 #endif
 
 #ifdef __arc__
 #define mb()		asm volatile("" ::: "memory")
 #define wmb()		asm volatile("" ::: "memory")
 #define rmb()		asm volatile("" ::: "memory")
-#define CPUINFO_PROC	"Processor"
+#define CPUINFO_PROC	{"Processor"}
 #endif
 
 #ifdef __metag__
 #define mb()		asm volatile("" ::: "memory")
 #define wmb()		asm volatile("" ::: "memory")
 #define rmb()		asm volatile("" ::: "memory")
-#define CPUINFO_PROC	"CPU"
+#define CPUINFO_PROC	{"CPU"}
 #endif
 
 #ifdef __xtensa__
 #define mb()		asm volatile("memw" ::: "memory")
 #define wmb()		asm volatile("memw" ::: "memory")
 #define rmb()		asm volatile("" ::: "memory")
-#define CPUINFO_PROC	"core ID"
+#define CPUINFO_PROC	{"core ID"}
 #endif
 
 #ifdef __tile__
@@ -162,7 +162,7 @@
 #define wmb()		asm volatile ("mf" ::: "memory")
 #define rmb()		asm volatile ("mf" ::: "memory")
 #define cpu_relax()	asm volatile ("mfspr zero, PASS" ::: "memory")
-#define CPUINFO_PROC    "model name"
+#define CPUINFO_PROC    {"model name"}
 #endif
 
 #define barrier() asm volatile ("" ::: "memory")

tools/perf/util/header.c

@@ -579,16 +579,12 @@ static int write_version(int fd, struct perf_header *h __maybe_unused,
 	return do_write_string(fd, perf_version_string);
 }
 
-static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
-		       struct perf_evlist *evlist __maybe_unused)
+static int __write_cpudesc(int fd, const char *cpuinfo_proc)
 {
-#ifndef CPUINFO_PROC
-#define CPUINFO_PROC NULL
-#endif
 	FILE *file;
 	char *buf = NULL;
 	char *s, *p;
-	const char *search = CPUINFO_PROC;
+	const char *search = cpuinfo_proc;
 	size_t len = 0;
 	int ret = -1;
 
@@ -638,6 +634,25 @@ static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
 	return ret;
 }
 
+static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
+		       struct perf_evlist *evlist __maybe_unused)
+{
+#ifndef CPUINFO_PROC
+#define CPUINFO_PROC {"model name", }
+#endif
+	const char *cpuinfo_procs[] = CPUINFO_PROC;
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
+		int ret;
+		ret = __write_cpudesc(fd, cpuinfo_procs[i]);
+		if (ret >= 0)
+			return ret;
+	}
+	return -1;
+}
+
+
 static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
 			struct perf_evlist *evlist __maybe_unused)
 {