rcu/nocb: Allow lockless use of rcu_segcblist_empty()

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Currently, rcu_segcblist_empty() assumes that the callback list is not
being changed by other CPUs, but upcoming changes will require it to
operate locklessly.  This commit therefore adds the needed READ_ONCE()
call, along with the WRITE_ONCE() calls when updating the callback list's
->head field.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

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This commit is contained in:

Paul E. McKenney 2019-05-13 15:57:50 -07:00

parent 76c6927c3e

commit e6060b41c9

2 changed files with 3 additions and 3 deletions

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4

kernel/rcu/rcu_segcblist.c

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2

kernel/rcu/rcu_segcblist.h

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