[PATCH v5] introduce macro spin_event_timeout()

[Josh Boyer]

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.

josh