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xf86atomic: require CAS support in libatomic_ops

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Since AO_compare_and_swap_full() is used by libdrm, AO_REQUIRE_CAS
must be defined before including <atomic_ops.h> so that we are sure
that CAS support will be provided. This is necessary to make sure that
the AO_compare_and_swap_full() function will be provided on all
architectures, including the ones that don't have built-in CAS support
such as SPARCv8.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Acked-by: Eric Engestrom <eric.engestrom@intel.com>
This commit is contained in:
Thomas Petazzoni 2016-05-26 10:46:57 +02:00 • committed by Peter Seiderer
parent 8c1185d22c
commit 8c51195039
1 changed files with 1 additions and 0 deletions
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xf86atomic.h
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@ -54,6 +54,7 @@ typedef struct {
#endif
#if HAVE_LIB_ATOMIC_OPS
#define AO_REQUIRE_CAS
#include <atomic_ops.h>
#define HAS_ATOMIC_OPS 1