perf tools: do not complain if root is owning perf.data

This improves patch fa6963b2 so that perf.data stuff that has
been dumped as root can be read (annotate/report) by a user
without the use of the --force.

Rationale is that root has plenty of ways to screw us (usually)
that do not require twisted schemes involving specially
crafting a perf.data.
Signed-off-by: NPierre Habouzit <pierre.habouzit@intersec.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <stable@kernel.org>
LKML-Reference: <20090827075902.GF19653@laphroaig.corp>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

tools/perf/builtin-annotate.c

@@ -984,8 +984,8 @@ static int __cmd_annotate(void)
 		exit(-1);
 	}
 
-	if (!force && (input_stat.st_uid != geteuid())) {
-		fprintf(stderr, "file: %s not owned by current user\n", input_name);
+	if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
+		fprintf(stderr, "file: %s not owned by current user or root\n", input_name);
 		exit(-1);
 	}
 

tools/perf/builtin-report.c

@@ -1405,8 +1405,8 @@ static int __cmd_report(void)
 		exit(-1);
 	}
 
-	if (!force && (input_stat.st_uid != geteuid())) {
-		fprintf(stderr, "file: %s not owned by current user\n", input_name);
+	if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
+		fprintf(stderr, "file: %s not owned by current user or root\n", input_name);
 		exit(-1);
 	}