linux-kernel - [PATCH 2/7] perf mmap: Using the stored scope data in perf_mmap_

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Date:   Mon,  5 Mar 2018 14:10:54 -0500
From:   kan.liang@...ux.intel.com
To:     acme@...nel.org, mingo@...hat.com, linux-kernel@...r.kernel.org
Cc:     jolsa@...hat.com, namhyung@...nel.org, wangnan0@...wei.com,
        ak@...ux.intel.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 2/7] perf mmap: Using the stored scope data in perf_mmap__push

From: Kan Liang <kan.liang@...ux.intel.com>

Using the 'start' and 'end' which are stored in struct perf_mmap to
replace the temporary 'start' and 'end'.
The temporary variables will be discarded later.

No functional change.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 tools/perf/util/mmap.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 642b479..4cb3614 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -294,12 +294,12 @@ int perf_mmap__push(struct perf_mmap *md, bool overwrite,
 	if (rc < 0)
 		return (rc == -EAGAIN) ? 0 : -1;
 
-	size = end - start;
+	size = md->end - md->start;
 
-	if ((start & md->mask) + size != (end & md->mask)) {
-		buf = &data[start & md->mask];
-		size = md->mask + 1 - (start & md->mask);
-		start += size;
+	if ((md->start & md->mask) + size != (md->end & md->mask)) {
+		buf = &data[md->start & md->mask];
+		size = md->mask + 1 - (md->start & md->mask);
+		md->start += size;
 
 		if (push(to, buf, size) < 0) {
 			rc = -1;
@@ -307,9 +307,9 @@ int perf_mmap__push(struct perf_mmap *md, bool overwrite,
 		}
 	}
 
-	buf = &data[start & md->mask];
-	size = end - start;
-	start += size;
+	buf = &data[md->start & md->mask];
+	size = md->end - md->start;
+	md->start += size;
 
 	if (push(to, buf, size) < 0) {
 		rc = -1;
-- 
2.4.11