atomic: Add atomic_cond_read_*_timeout()

Add atomic_cond_read_*_timeout() and, atomic64_cond_read_*_timeout(),
to provide atomic load wrappers around the cond-load timeout interfaces.

Cc: Will Deacon <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Boqun Feng <[email protected]>
Signed-off-by: Ankur Arora <[email protected]>

Author: terminus

include/linux/atomic.h

@@ -31,6 +31,14 @@
 #define atomic64_cond_read_acquire(v, c) smp_cond_load_acquire(&(v)->counter, (c))
 #define atomic64_cond_read_relaxed(v, c) smp_cond_load_relaxed(&(v)->counter, (c))
 
+#define atomic_cond_read_acquire_timeout(v, c, t) \
+	smp_cond_load_acquire_timeout(&(v)->counter, (c), (t))
+#define atomic_cond_read_relaxed_timeout(v, c, t) \
+	smp_cond_load_relaxed_timeout(&(v)->counter, (c), (t))
+
+#define atomic64_cond_read_acquire_timeout(v, c) smp_cond_load_acquire_timeout(&(v)->counter, (c))
+#define atomic64_cond_read_relaxed_timeout(v, c) smp_cond_load_relaxed_timeout(&(v)->counter, (c))
+
 /*
  * The idea here is to build acquire/release variants by adding explicit
  * barriers on top of the relaxed variant. In the case where the relaxed