[PATCH 01/10] perf buildid-list: Show running kernel build id fix

From: Arnaldo Carvalho de Melo
Date: Fri Nov 27 2015 - 20:25:09 EST


From: Michael Petlan <mpetlan@xxxxxxxxxx>

The --kernel option of perf buildid-list tool should show the running
kernel buildid. The functionality has been lost during other changes of
the related code.

The build_id__sprintf() function should return length of the build-id
string, but it was the length of the build-id raw data instead. Due to
that, some return value checking caused that the final string was not
printed out.

With this patch the build_id__sprintf() returns the correct value, so
the --kernel option works again.

Before:

# perf buildid-list --kernel
#

After:

# perf buildid-list --kernel
972c1edab5bdc06cc224af45d510af662a3c6972
#

Signed-off-by: Michael Petlan <mpetlan@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
LPU-Reference: 1448632089.24573.114.camel@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/build-id.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 217b5a60e2ab..6a7e273a514a 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -91,7 +91,7 @@ int build_id__sprintf(const u8 *build_id, int len, char *bf)
bid += 2;
}

- return raw - build_id;
+ return (bid - bf) + 1;
}

int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
--
2.1.0

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