linux-kernel - Re: [PATCH] Fix/add raw1394 CONFIG

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Date:	Sun, 20 May 2007 17:37:39 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	dan@...nedy.org, Petr Vandrovec <petr@...drovec.name>,
	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix/add raw1394 CONFIG_COMPAT code

On Sunday 20 May 2007, Stefan Richter wrote:
> maybe we should change
> 
> /* argument to RAW1394_IOC_GET_CYCLE_TIMER ioctl */
> struct raw1394_cycle_timer {
>         /* contents of Isochronous Cycle Timer register,
>            as in OHCI 1.1 clause 5.13 (also with non-OHCI hosts) */
>         __u32 cycle_timer;
> 
>         /* local time in microseconds since Epoch,
>            simultaneously read with cycle timer */
>         __u64 local_time;
> };
> 
> to
> 
> /* argument to RAW1394_IOC_GET_CYCLE_TIMER ioctl */
> struct raw1394_cycle_timer {
>         /*
>          * least significant 32 bits are contents of Isochronous Cycle
>          * Timer register, as in OHCI 1.1 clause 5.13 (also with
>          * non-OHCI hosts)
>          */
>         __u64 cycle_timer;
> 
>         /*
>          * local time in microseconds since Epoch,
>          * simultaneously read with cycle timer
>          */
>         __u64 local_time;
> };
> 
> before a libraw1394 with get-cycle-timer support is released.

Yes, if you still have the chance to change this without breaking
users, that would be ideal.

I assume that struct raw1394_iso_packets is already set in stone,
right? Otherwise it would be good to make that a compatible structure
as well.

	Arnd <><
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