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* [PATCH,v2] [media] vivi: Constify structures
From: Kirill Smelkov @ 2012-12-28 13:12 UTC (permalink / raw)
  To: Hans Verkuil; +Cc: Mauro Carvalho Chehab, linux-media, linux-kernel
In-Reply-To: <201212271255.11159.hverkuil@xs4all.nl>

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@navytux.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@navytux.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@navytux.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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