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Commit 066bb1c8 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

doc: Update rcu_assign_pointer() definition in whatisRCU.txt 



The rcu_assign_pointer() macro has changed over time, and the version
in Documentation/RCU/whatisRCU.txt has not kept up.  This commit brings
it into 2017, albeit in a simplified fashion.

Reported-by: default avatarAndrea Parri <parri.andrea@gmail.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 6771853b

Documentation/RCU/whatisRCU.txt

+15 −14
Original line number Diff line number Diff line
@@ -587,16 +587,17 @@ It is extremely simple: 
		write_unlock(&rcu_gp_mutex);

	}



[You can ignore rcu_assign_pointer() and rcu_dereference() without

missing much.  But here they are anyway.  And whatever you do, don't

forget about them when submitting patches making use of RCU!]

[You can ignore rcu_assign_pointer() and rcu_dereference() without missing

much.  But here are simplified versions anyway.  And whatever you do,

don't forget about them when submitting patches making use of RCU!]



	#define rcu_assign_pointer(p, v)	({ \

							smp_wmb(); \

							(p) = (v); \

	#define rcu_assign_pointer(p, v) \

	({ \

		smp_store_release(&(p), (v)); \

	})



	#define rcu_dereference(p)     ({ \

	#define rcu_dereference(p) \

	({ \

		typeof(p) _________p1 = p; \

		smp_read_barrier_depends(); \

		(_________p1); \