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Message-ID: <20121228131256.GA2688@mini.zxlink>
Date: Fri, 28 Dec 2012 17:12:56 +0400
From: Kirill Smelkov <kirr@...ytux.spb.ru>
To: Hans Verkuil <hverkuil@...all.nl>
Cc: Mauro Carvalho Chehab <mchehab@...hat.com>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH,v2] [media] vivi: Constify structures
On Thu, Dec 27, 2012 at 12:55:11PM +0100, Hans Verkuil wrote:
> On Wed December 26 2012 16:29:43 Kirill Smelkov wrote:
> > Most of *_ops and other structures in vivi.c were already declared const
> > but some have not. Constify and code/data will take less space:
> >
> > $ size drivers/media/platform/vivi.o
> > text data bss dec hex filename
> > before: 12569 248 8 12825 3219 drivers/media/platform/vivi.o
> > after: 12308 20 8 12336 3030 drivers/media/platform/vivi.o
> >
> > i.e. vivi.o is now ~500 bytes less.
> >
> > Signed-off-by: Kirill Smelkov <kirr@...ytux.spb.ru>
> > ---
> > drivers/media/platform/vivi.c | 26 +++++++++++++-------------
> > 1 file changed, 13 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/media/platform/vivi.c b/drivers/media/platform/vivi.c
> > index ec65089..bed04e1 100644
> > --- a/drivers/media/platform/vivi.c
> > +++ b/drivers/media/platform/vivi.c
> > @@ -91,13 +91,13 @@ static const struct v4l2_fract
> > ------------------------------------------------------------------*/
> >
> > struct vivi_fmt {
> > - char *name;
> > + const char *name;
>
> Just use one space before '*' since it no longer lines up to anything.
[...]
> > @@ -191,7 +191,7 @@ struct vivi_buffer {
> > /* common v4l buffer stuff -- must be first */
> > struct vb2_buffer vb;
> > struct list_head list;
> > - struct vivi_fmt *fmt;
> > + struct vivi_fmt const *fmt;
> > };
> >
> > struct vivi_dmaqueue {
> > @@ -250,7 +250,7 @@ struct vivi_dev {
> > int input;
> >
> > /* video capture */
> > - struct vivi_fmt *fmt;
> > + struct vivi_fmt const *fmt;
>
> 'const' should be before 'struct' for consistency reasons.
It's just a matter of style, and in this case I though putting const
after would not distract from the fact that fmt is `struct vivi_fmt *`
and also to align types beginning with non-const ones.
But anyway, style is style and this is not a big deal, so here you are
with corrected patch.
Thanks,
Kirill
---- 8< ----
From: Kirill Smelkov <kirr@...ytux.spb.ru>
Date: Wed, 26 Dec 2012 19:23:26 +0400
Subject: [PATCH,v2] [media] vivi: Constify structures
Most of *_ops and other structures in vivi.c were already declared const
but some have not. Constify and code/data will take less space:
$ size drivers/media/platform/vivi.o
text data bss dec hex filename
before: 12569 248 8 12825 3219 drivers/media/platform/vivi.o
after: 12308 20 8 12336 3030 drivers/media/platform/vivi.o
i.e. vivi.o is now ~500 bytes less.
Signed-off-by: Kirill Smelkov <kirr@...ytux.spb.ru>
---
drivers/media/platform/vivi.c | 26 +++++++++++++-------------
1 file changed, 13 insertions(+), 13 deletions(-)
v2:
- put 'const' always before anything, as noted by Hans Verkuil.
- no changes otherwise.
diff --git a/drivers/media/platform/vivi.c b/drivers/media/platform/vivi.c
index ec65089..8a33a71 100644
--- a/drivers/media/platform/vivi.c
+++ b/drivers/media/platform/vivi.c
@@ -91,13 +91,13 @@ static const struct v4l2_fract
------------------------------------------------------------------*/
struct vivi_fmt {
- char *name;
+ const char *name;
u32 fourcc; /* v4l2 format id */
u8 depth;
bool is_yuv;
};
-static struct vivi_fmt formats[] = {
+static const struct vivi_fmt formats[] = {
{
.name = "4:2:2, packed, YUYV",
.fourcc = V4L2_PIX_FMT_YUYV,
@@ -164,9 +164,9 @@ static struct vivi_fmt formats[] = {
},
};
-static struct vivi_fmt *__get_format(u32 pixelformat)
+static const struct vivi_fmt *__get_format(u32 pixelformat)
{
- struct vivi_fmt *fmt;
+ const struct vivi_fmt *fmt;
unsigned int k;
for (k = 0; k < ARRAY_SIZE(formats); k++) {
@@ -181,7 +181,7 @@ static struct vivi_fmt *__get_format(u32 pixelformat)
return &formats[k];
}
-static struct vivi_fmt *get_format(struct v4l2_format *f)
+static const struct vivi_fmt *get_format(struct v4l2_format *f)
{
return __get_format(f->fmt.pix.pixelformat);
}
@@ -191,7 +191,7 @@ struct vivi_buffer {
/* common v4l buffer stuff -- must be first */
struct vb2_buffer vb;
struct list_head list;
- struct vivi_fmt *fmt;
+ const struct vivi_fmt *fmt;
};
struct vivi_dmaqueue {
@@ -250,7 +250,7 @@ struct vivi_dev {
int input;
/* video capture */
- struct vivi_fmt *fmt;
+ const struct vivi_fmt *fmt;
struct v4l2_fract timeperframe;
unsigned int width, height;
struct vb2_queue vb_vidq;
@@ -297,7 +297,7 @@ struct bar_std {
/* Maximum number of bars are 10 - otherwise, the input print code
should be modified */
-static struct bar_std bars[] = {
+static const struct bar_std bars[] = {
{ /* Standard ITU-R color bar sequence */
{ COLOR_WHITE, COLOR_AMBER, COLOR_CYAN, COLOR_GREEN,
COLOR_MAGENTA, COLOR_RED, COLOR_BLUE, COLOR_BLACK, COLOR_BLACK }
@@ -926,7 +926,7 @@ static void vivi_unlock(struct vb2_queue *vq)
}
-static struct vb2_ops vivi_video_qops = {
+static const struct vb2_ops vivi_video_qops = {
.queue_setup = queue_setup,
.buf_prepare = buffer_prepare,
.buf_queue = buffer_queue,
@@ -957,7 +957,7 @@ static int vidioc_querycap(struct file *file, void *priv,
static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
- struct vivi_fmt *fmt;
+ const struct vivi_fmt *fmt;
if (f->index >= ARRAY_SIZE(formats))
return -EINVAL;
@@ -993,7 +993,7 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct vivi_dev *dev = video_drvdata(file);
- struct vivi_fmt *fmt;
+ const struct vivi_fmt *fmt;
fmt = get_format(f);
if (!fmt) {
@@ -1102,7 +1102,7 @@ static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
static int vidioc_enum_frameintervals(struct file *file, void *priv,
struct v4l2_frmivalenum *fival)
{
- struct vivi_fmt *fmt;
+ const struct vivi_fmt *fmt;
if (fival->index)
return -EINVAL;
@@ -1330,7 +1330,7 @@ static const struct v4l2_ioctl_ops vivi_ioctl_ops = {
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
-static struct video_device vivi_template = {
+static const struct video_device vivi_template = {
.name = "vivi",
.fops = &vivi_fops,
.ioctl_ops = &vivi_ioctl_ops,
--
1.8.1.rc3.329.g036938a
--
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