atomic: add atomic_add_unless()
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
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Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
mentioned in commit 3ff3d59e