[PATCH] media: allegro-dvt: Use __packed sentence

[PATCH] media: allegro-dvt: Use __packed sentence

[Emmanuel Arias]

Fix coding style using __packed sentece instead of
__attribute__((__packed__)).

Signed-off-by: Emmanuel Arias <eamanu@yaerobi.com>
---
 drivers/staging/media/allegro-dvt/allegro-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/media/allegro-dvt/allegro-core.c b/drivers/staging/media/allegro-dvt/allegro-core.c
index 9f718f43282b..cee624dac61a 100644
--- a/drivers/staging/media/allegro-dvt/allegro-core.c
+++ b/drivers/staging/media/allegro-dvt/allegro-core.c
@@ -670,7 +670,7 @@ static ssize_t allegro_mbox_read(struct allegro_mbox *mbox,
 	struct {
 		u16 length;
 		u16 type;
-	} __attribute__ ((__packed__)) *header;
+	} __packed *header;
 	struct regmap *sram = mbox->dev->sram;
 	unsigned int head;
 	ssize_t size;
-- 
2.29.2

RE: [PATCH] media: allegro-dvt: Use __packed sentence

[David Laight]

From: Emmanuel Arias
> Sent: 29 January 2021 20:02
> 
> Fix coding style using __packed sentece instead of
> __attribute__((__packed__)).
> 
> Signed-off-by: Emmanuel Arias <eamanu@yaerobi.com>
> ---
>  drivers/staging/media/allegro-dvt/allegro-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/allegro-dvt/allegro-core.c b/drivers/staging/media/allegro-
> dvt/allegro-core.c
> index 9f718f43282b..cee624dac61a 100644
> --- a/drivers/staging/media/allegro-dvt/allegro-core.c
> +++ b/drivers/staging/media/allegro-dvt/allegro-core.c
> @@ -670,7 +670,7 @@ static ssize_t allegro_mbox_read(struct allegro_mbox *mbox,
>  	struct {
>  		u16 length;
>  		u16 type;
> -	} __attribute__ ((__packed__)) *header;
> +	} __packed *header;
>  	struct regmap *sram = mbox->dev->sram;

Does this actually need to be packed?
The only reason would be if the structure could exist on a 2n+1
boundary.
But that is only likely if part of some binary sequence.
In which case I'd expect it to be marked __be or __le.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

Re: [PATCH] media: allegro-dvt: Use __packed sentence

[Greg KH]

On Fri, Jan 29, 2021 at 05:01:54PM -0300, Emmanuel Arias wrote:
> Fix coding style using __packed sentece instead of

Spelling check please?

And _why_ are you making this change, what does this do "better" than
the original?

thanks,

greg k-h

Re: [PATCH] media: allegro-dvt: Use __packed sentence

[Emmanuel Arias]

Hi,

> 
> Spelling check please?
> 
> And _why_ are you making this change, what does this do "better" than
> the original?
>
Actually, I'm really new here, and this is my first patch. I run the
checkpatch.pl, and give me that recommendation. 

I would like to look the David comments.

Thanks!
eamanu

> thanks,
> 
> greg k-h

Re: [PATCH] media: allegro-dvt: Use __packed sentence

[Michael Tretter]

On Fri, 29 Jan 2021 23:54:41 +0000, David Laight wrote:
> From: Emmanuel Arias
> > Sent: 29 January 2021 20:02
> > 
> > Fix coding style using __packed sentece instead of
> > __attribute__((__packed__)).
> > 
> > Signed-off-by: Emmanuel Arias <eamanu@yaerobi.com>
> > ---
> >  drivers/staging/media/allegro-dvt/allegro-core.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/staging/media/allegro-dvt/allegro-core.c b/drivers/staging/media/allegro-
> > dvt/allegro-core.c
> > index 9f718f43282b..cee624dac61a 100644
> > --- a/drivers/staging/media/allegro-dvt/allegro-core.c
> > +++ b/drivers/staging/media/allegro-dvt/allegro-core.c
> > @@ -670,7 +670,7 @@ static ssize_t allegro_mbox_read(struct allegro_mbox *mbox,
> >  	struct {
> >  		u16 length;
> >  		u16 type;
> > -	} __attribute__ ((__packed__)) *header;
> > +	} __packed *header;
> >  	struct regmap *sram = mbox->dev->sram;
> 
> Does this actually need to be packed?
> The only reason would be if the structure could exist on a 2n+1
> boundary.

Not sure, what you mean by this.

> But that is only likely if part of some binary sequence.
> In which case I'd expect it to be marked __be or __le.

It is part of a binary sequence. It is the header of messages in a mailbox
that is used to exchange data with a co-processor (video encoder). In fact, it
should be marked as __le.

Michael