Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 55c2945a authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Ingo Molnar
Browse files

atomic: Add atomic_or() 



An atomic_or() function is needed by TREE_RCU to avoid deadlock, so
add a generic version.

Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 29f742f8

include/linux/atomic.h

+13 −0
Original line number Diff line number Diff line
@@ -34,4 +34,17 @@ static inline int atomic_inc_not_zero_hint(atomic_t *v, int hint) 
}

#endif



#ifndef CONFIG_ARCH_HAS_ATOMIC_OR

static inline void atomic_or(int i, atomic_t *v)

{

	int old;

	int new;



	do {

		old = atomic_read(v);

		new = old | i;

	} while (atomic_cmpxchg(v, old, new) != old);

}

#endif /* #ifndef CONFIG_ARCH_HAS_ATOMIC_OR */



#endif /* _LINUX_ATOMIC_H */