Hi Rémi,
Rémi Denis-Courmont wrote:
Le vendredi 14 septembre 2012 23:25:01, Sakari Ailus a écrit :
I had a quick discussion with Laurent, and what he suggested was to use
the kernel version to figure out the type of the timestamp. The drivers
that use the monotonic time right now wouldn't be affected by the new
flag on older kernels. If we've decided we're going to switch to
monotonic time anyway, why not just change all the drivers now and
forget the capability flag.
That does not work In Real Life.
People do port old drivers forward to new kernels.
People do port new drivers back to old kernels
Why would you port a driver from an old kernel to a new kernel? Or are
you talking about out-of-tree drivers?
If you do port drivers across different kernel versions I guess you're
supposed to use the appropriate interfaces for those kernels, too. Using
a helper function helps here, so compiling a backported driver would
fail w/o the helper function that produces the timestamp, forcing the
backporter to notice the situation.
Anyway, I don't have a very strict opinion on this, so I'm okay with the
flag, too, but I personally simply don't think it's the best choice we
can make now. Also, without converting the drivers now the user space
must live with different kinds of timestamps much longer.
Cc Laurent and Hans.
Kind regards,
--
Sakari Ailus
sakari.ailus@xxxxxx
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