On Fri, Jul 19, 2013 at 10:20:19AM -0400, Nicolas Pitre wrote:
> On Fri, 19 Jul 2013, Will Deacon wrote:
>
> > Looks good to me. The current scheme would be very fiddly to extend to
> > 64-bit values on 32-bit architectures without cheap atomic doubleword
> > accesses.
>
> You should have a look
On Fri, 19 Jul 2013, Will Deacon wrote:
> Looks good to me. The current scheme would be very fiddly to extend to
> 64-bit values on 32-bit architectures without cheap atomic doubleword
> accesses.
You should have a look at include/linux/cnt32_to_63.h.
This could be applied to pure software counte
On Fri, Jul 19, 2013 at 12:21:15AM +0100, Stephen Boyd wrote:
> We're going to increase the cyc value to 64 bits in the near
> future. Doing that is going to break the custom seqcount
> implementation in the sched_clock code because 64 bit numbers
> aren't guaranteed to be atomic. Replace the cyc_c
We're going to increase the cyc value to 64 bits in the near
future. Doing that is going to break the custom seqcount
implementation in the sched_clock code because 64 bit numbers
aren't guaranteed to be atomic. Replace the cyc_copy with a
seqcount to avoid this problem.
Cc: Russell King
Signed-o
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