linux-kernel - Re: [PATCH] [RESEND] [media] omap3isp: support 64-bit version of omap3isp_stat

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Message-ID: <20180507101846.vmn4yqqu7i3iybcd@valkosipuli.retiisi.org.uk>
Date:   Mon, 7 May 2018 13:18:46 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [RESEND] [media] omap3isp: support 64-bit version of
 omap3isp_stat_data

On Thu, May 03, 2018 at 06:06:58PM -0400, Arnd Bergmann wrote:
> On Thu, May 3, 2018 at 8:56 AM, Sakari Ailus <sakari.ailus@....fi> wrote:
> > On Wed, Apr 25, 2018 at 11:30:10PM +0200, Arnd Bergmann wrote:
> >> @@ -165,7 +167,14 @@ struct omap3isp_h3a_aewb_config {
> >>   * @config_counter: Number of the configuration associated with the data.
> >>   */
> >>  struct omap3isp_stat_data {
> >> +#ifdef __KERNEL__
> >> +     struct {
> >> +             __s64   tv_sec;
> >> +             __s64   tv_usec;
> >
> > Any particular reason for __s64 here instead of e.g. long or __s32? Kernel
> > appears to use long in the timespec64 definition.
> 
> The user space 'timeval' definition is 16 bytes wide, with the layout
> designed to be compatible between 32-bit and 64-bit, so it has to be like
> this to match what user spaces sees with the old header files and a new
> libc.
> 
> We don't yet know what the exact definition of timeval will be in all
> libc implementations, but if they have a 32-bit tv_user field, it needs

tv_usec?

> padding next to it so the lower 32 bits are in the same place as they
> would be using that 64-bit field I used.

I presume the definition would be endianness dependent then. I have no
objections though, if you think this is the way to go.

I'll apply the patch.

Thanks.

-- 
Sakari Ailus
e-mail: sakari.ailus@....fi