linux-kernel - RE: [PATCH 02/11] media: vsp1: use kernel _

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Date:   Tue, 13 Mar 2018 11:20:04 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Kieran Bingham' <kieran.bingham+renesas@...asonboard.com>,
        "Laurent Pinchart" <laurent.pinchart@...asonboard.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 02/11] media: vsp1: use kernel __packed for structures

From: Kieran Bingham
> Sent: 09 March 2018 22:04
> The kernel provides a __packed definition to abstract away from the
> compiler specific attributes tag.
> 
> Convert all packed structures in VSP1 to use it.
> 
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> ---
>  drivers/media/platform/vsp1/vsp1_dl.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c
> index 37e2c984fbf3..382e45c2054e 100644
> --- a/drivers/media/platform/vsp1/vsp1_dl.c
> +++ b/drivers/media/platform/vsp1/vsp1_dl.c
> @@ -29,19 +29,19 @@
>  struct vsp1_dl_header_list {
>  	u32 num_bytes;
>  	u32 addr;
> -} __attribute__((__packed__));
> +} __packed;
> 
>  struct vsp1_dl_header {
>  	u32 num_lists;
>  	struct vsp1_dl_header_list lists[8];
>  	u32 next_header;
>  	u32 flags;
> -} __attribute__((__packed__));
> +} __packed;
> 
>  struct vsp1_dl_entry {
>  	u32 addr;
>  	u32 data;
> -} __attribute__((__packed__));
> +} __packed;

Do these structures ever actually appear in misaligned memory?
If they don't then they shouldn't be marked 'packed'.

	David