linux-kernel - [PATCH 24/41] perf dso: Simplify dso_cache_

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Message-Id: <20190529133605.21118-25-acme@kernel.org>
Date:   Wed, 29 May 2019 10:35:48 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Song Liu <songliubraving@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 24/41] perf dso: Simplify dso_cache__read function

From: Jiri Olsa <jolsa@...nel.org>

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@...nel.org>
Acked-by: Song Liu <songliubraving@...com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Song Liu <songliubraving@...com>
Cc: Stanislav Fomichev <sdf@...gle.com>
Link: http://lkml.kernel.org/r/20190508132010.14512-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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 */
-- 
2.20.1