[PATCH v5] introduce macro spin_event_timeout()

[Josh Boyer]

On Wed, Mar 11, 2009 at 10:59:11AM +1100, Benjamin Herrenschmidt wrote:
>On Tue, 2009-03-10 at 18:37 -0400, Josh Boyer wrote:
>> On Tue, Mar 10, 2009 at 05:33:08PM -0500, Scott Wood wrote:
>> > Timur Tabi wrote:
>> >> The macro spin_event_timeout() takes a condition and timeout value
>> >> (in microseconds) as parameters.  It spins until either the condition is true
>> >> or the timeout expires.  It returns zero if the timeout expires first, non-zero
>> >> otherwise.
>> >>
>> >> This primary purpose of this macro is to poll on a hardware register until a
>> >> status bit changes.  The timeout ensures that the loop still terminates if the
>> >> bit doesn't change as expected.  This macro makes it easier for driver
>> >> developers to perform this kind of operation properly.
>> >>
>> >> Signed-off-by: Timur Tabi <timur at freescale.com>
>> >> ---
>> >>
>> >> v5: ported to arch/powerpc, made it powerpc-specific, eliminated udelay
>> >
>> > Why make it powerpc-specific?  This would be nice to have in  
>> > arch-independent code.
>> 
>> That's just mean.  He already posted it to lkml and was told to make it
>> powerpc specific by Alan.
>
>And ? We can disagree with Alan...

Did I say Alan was right?  I'm just explaining why Timur probably posted it
as arch-specific.

josh