linux-kernel - [PATCH v4 7/8] perf session: Introduce reader return codes

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Message-Id: <5fca481e91c3c5d2ba033d4c6e9b969f8033ab0f.1634113027.git.alexey.v.bayduraev@linux.intel.com>
Date:   Wed, 13 Oct 2021 12:06:41 +0300
From:   Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>
Subject: [PATCH v4 7/8] perf session: Introduce reader return codes

Adding reader READER_OK and READER_NODATA return codes to make
the code more clear.

Suggested-by: Jiri Olsa <jolsa@...nel.org>
Acked-by: Namhyung Kim <namhyung@...il.com>
Reviewed-by: Riccardo Mancini <rickyman7@...il.com>
Tested-by: Riccardo Mancini <rickyman7@...il.com>
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
---
 tools/perf/util/session.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 68d130fe51c2..9714881839e3 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -2258,12 +2258,17 @@ reader__mmap(struct reader *rd, struct perf_session *session)
 	return 0;
 }
 
+enum {
+	READER_OK,
+	READER_NODATA,
+};
+
 static int
 reader__read_event(struct reader *rd, struct perf_session *session,
 		   struct ui_progress *prog)
 {
 	u64 size;
-	int err = 0;
+	int err = READER_OK;
 	union perf_event *event;
 	s64 skip;
 
@@ -2273,7 +2278,7 @@ reader__read_event(struct reader *rd, struct perf_session *session,
 		return PTR_ERR(event);
 
 	if (!event)
-		return 1;
+		return READER_NODATA;
 
 	size = event->header.size;
 
@@ -2325,7 +2330,7 @@ reader__process_events(struct reader *rd, struct perf_session *session,
 	err = reader__read_event(rd, session, prog);
 	if (err < 0)
 		goto out;
-	else if (err == 1)
+	else if (err == READER_NODATA)
 		goto remap;
 
 	if (session_done())
-- 
2.19.0