linux-kernel - [PATCH 1/3] media: dvb-core: Optimize the code using vmalloc

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Message-Id: <20251021143122.268730-2-tanze@kylinos.cn>
Date: Tue, 21 Oct 2025 22:31:20 +0800
From: tanze <tanze@...inos.cn>
To: mchehab@...nel.org,
	mingo@...nel.org,
	hverkuil@...nel.org,
	tskd08@...il.com
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tanze <tanze@...inos.cn>
Subject: [PATCH 1/3] media: dvb-core: Optimize the code using vmalloc_array

Change array_size() to vmalloc_array(), Due to vmalloc_array() is optimized better,
uses fewer instructions, and handles overflow more concisely

Signed-off-by: tanze <tanze@...inos.cn>
---
 drivers/media/dvb-core/dmxdev.c    | 4 ++--
 drivers/media/dvb-core/dvb_demux.c | 9 +++++----
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxdev.c
index 151177e5a06d..8c6f5aafda1d 100644
--- a/drivers/media/dvb-core/dmxdev.c
+++ b/drivers/media/dvb-core/dmxdev.c
@@ -1414,8 +1414,8 @@ int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
 	if (dmxdev->demux->open(dmxdev->demux) < 0)
 		return -EUSERS;
 
-	dmxdev->filter = vmalloc(array_size(sizeof(struct dmxdev_filter),
-					    dmxdev->filternum));
+	dmxdev->filter = vmalloc_array(dmxdev->filternum,
+				       sizeof(struct dmxdev_filter));
 	if (!dmxdev->filter)
 		return -ENOMEM;
 
diff --git a/drivers/media/dvb-core/dvb_demux.c b/drivers/media/dvb-core/dvb_demux.c
index 7c4d86bfdd6c..9d5600501cf8 100644
--- a/drivers/media/dvb-core/dvb_demux.c
+++ b/drivers/media/dvb-core/dvb_demux.c
@@ -1238,14 +1238,15 @@ int dvb_dmx_init(struct dvb_demux *dvbdemux)
 
 	dvbdemux->cnt_storage = NULL;
 	dvbdemux->users = 0;
-	dvbdemux->filter = vmalloc(array_size(sizeof(struct dvb_demux_filter),
-					      dvbdemux->filternum));
+	dvbdemux->filter = vmalloc_array(dvbdemux->filternum,
+					 sizeof(struct dvb_demux_filter));
 
 	if (!dvbdemux->filter)
 		return -ENOMEM;
 
-	dvbdemux->feed = vmalloc(array_size(sizeof(struct dvb_demux_feed),
-					    dvbdemux->feednum));
+	dvbdemux->feed = vmalloc_array(dvbdemux->feednum,
+				       sizeof(struct dvb_demux_feed));
+
 	if (!dvbdemux->feed) {
 		vfree(dvbdemux->filter);
 		dvbdemux->filter = NULL;
-- 
2.25.1