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Re: [PATCH 1/2] Optimize generic spinlock code and use C11 like atomic macros.

On 04/11/2017 02:05 PM, Andreas Schwab wrote:

On Apr 11 2017, Stefan Liebler <stli@linux.vnet.ibm.com> wrote:


It happened in the case of __HAVE_64B_ATOMICS.


We shouldn't follow a bad example.

Andreas.



Then I'll change the check to:
/* ATOMIC_EXCHANGE_USES_CAS is non-zero if atomic_exchange operations
are implemented based on a CAS loop; otherwise, this is zero and we assume 
   that the atomic_exchange operations could provide better performance
   than a CAS loop.  */
#ifndef ATOMIC_EXCHANGE_USES_CAS
# error ATOMIC_EXCHANGE_USES_CAS has to be defined.
#endif

Bye
Stefan
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