On 07/17/2015 05:35 AM, Will Deacon wrote:
On Fri, Jul 17, 2015 at 01:00:34AM +0100, Waiman Long wrote:
On 07/16/2015 05:08 PM, Peter Zijlstra wrote:
On Thu, Jul 16, 2015 at 04:40:03PM -0400, Waiman Long wrote:
On 07/16/2015 11:32 AM, Will Deacon wrote:
@@ -117,6 +115,8 @@ static inline unsigned long __xchg(unsigned long x,
volatile void *ptr, int size
#error "SMP is not supported on this platform"
^^^^^^^^^^^^^
That #error is only for ARMv5 or below.
#endif
+#define xchg xchg_relaxed
Is that a typo? I think xchg() needs to be a full memory barrier.
Pointless on UP.
I don't see the problem here. As Peter pointed out, this code only gets
looked at if !SMP and structuring it this way means I can have one
definition of xchg_relaxed, regardless of architecture version.
Will
I am sorry that I got confused as to where it is defined. It should be
OK in this case.
Cheers,
Longman
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