[PATCH] perf_event: fix 'perf record'

[Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>]

'-a' parameter works abnormal in 'perf record', it conduces
'perf sched record' and 'perf kmem record' unwork.

This bug was introduced by:
commit 856e96608a72412d319e498a3a7c557571f811bd

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
 tools/perf/builtin-record.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 63136d0..105ea23 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -483,7 +483,7 @@ static int __cmd_record(int argc __used, const char **argv)
 
 	atexit(atexit_header);
 
-	if (target_pid == -1) {
+	if (target_pid == -1 && argc) {
 		pid = fork();
 		if (pid < 0) {
 			perror("failed to fork");
@@ -667,7 +667,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
 
 	argc = parse_options(argc, argv, options, record_usage,
 			    PARSE_OPT_STOP_AT_NON_OPTION);
-	if (!argc && target_pid == -1 && (!system_wide || profile_cpu == -1))
+	if (!argc && target_pid == -1 && !system_wide && profile_cpu == -1)
 		usage_with_options(record_usage, options);
 
 	symbol__init();
-- 
1.6.1.2