perf alias: Remove trailing newline when reading sysfs files

Remove a trailing newline when reading sysfs file contents such as
/sys/devices/cpum_cf/events/TX_NC_TEND.  This shows when verbose option
-v is used.

Output before:

  tx_nc_tend -> 'cpum_cf'/'event=0x008d
  '/

Output after:

  tx_nc_tend -> 'cpum_cf'/'event=0x8d'/

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20180615101105.47047-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index d2fb597..2738fc8 100644 (file)
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -303,6 +303,9 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
 
        buf[ret] = 0;
 
+       /* Remove trailing newline from sysfs file */
+       rtrim(buf);
+
        return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL, NULL, NULL,
                                     NULL, NULL, NULL);
 }