[tip:perf/core] perf dso: Simplify dso_cache__read function

tip-bot for Jiri Olsa
2019-05-30T08:10:07Z

Commit-ID: cacddfe7b0804752528e8100461266ec33dc6b64
Gitweb: https://git.kernel.org/tip/cacddfe7b0804752528e8100461266ec33dc6b64
Author: Jiri Olsa <jolsa@kernel.org>
AuthorDate: Wed, 8 May 2019 15:20:01 +0200
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 28 May 2019 18:37:44 -0300

perf dso: Simplify dso_cache__read function

There's no need for the while loop now, also we can connect two (ret >
0) condition legs together.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stanislav Fomichev <sdf@google.com>
Link: http://lkml.kernel.org/r/20190508132010.14512-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/dso.c | 17 ++++++-----------
1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 7734f50a6912..1e6a045adb8c 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -823,25 +823,20 @@ static ssize_t
dso_cache__read(struct dso *dso, struct machine *machine,
u64 offset, u8 *data, ssize_t size)
{
+ u64 cache_offset = offset & DSO__DATA_CACHE_MASK;
struct dso_cache *cache;
struct dso_cache *old;
ssize_t ret;

- do {
- u64 cache_offset = offset & DSO__DATA_CACHE_MASK;
-
- cache = zalloc(sizeof(*cache) + DSO__DATA_CACHE_SIZE);
- if (!cache)
- return -ENOMEM;
-
- ret = file_read(dso, machine, cache_offset, cache->data);
+ cache = zalloc(sizeof(*cache) + DSO__DATA_CACHE_SIZE);
+ if (!cache)
+ return -ENOMEM;

+ ret = file_read(dso, machine, cache_offset, cache->data);
+ if (ret > 0) {
cache->offset = cache_offset;
cache->size = ret;
- } while (0);
-

- if (ret > 0) {
old = dso_cache__insert(dso, cache);
if (old) {
/* we lose the race */