perf_counter tools: Fix error condition in parse_aliases()

gcc warned about this bug:

util/parse-events.c: In function ‘parse_generic_hw_symbols’:
util/parse-events.c:175: warning: comparison is always false due to limited range of data type
util/parse-events.c:182: warning: comparison is always false due to limited range of data type
util/parse-events.c:190: warning: comparison is always false due to limited range of data type

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index e0820b4..f18a9a0 100644 (file)
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -160,12 +160,12 @@ static int parse_aliases(const char *str, char *names[][MAX_ALIASES], int size)
                }
        }
 
-       return 0;
+       return -1;
 }
 
 static int parse_generic_hw_symbols(const char *str, struct perf_counter_attr *attr)
 {
-       __u8 cache_type = -1, cache_op = 0, cache_result = 0;
+       int cache_type = -1, cache_op = 0, cache_result = 0;
 
        cache_type = parse_aliases(str, hw_cache, PERF_COUNT_HW_CACHE_MAX);
        /*
@@ -179,8 +179,8 @@ static int parse_generic_hw_symbols(const char *str, struct perf_counter_attr *a
        /*
         * Fall back to reads:
         */
-       if (cache_type == -1)
-               cache_type = PERF_COUNT_HW_CACHE_OP_READ;
+       if (cache_op == -1)
+               cache_op = PERF_COUNT_HW_CACHE_OP_READ;
 
        cache_result = parse_aliases(str, hw_cache_result,
                                        PERF_COUNT_HW_CACHE_RESULT_MAX);