rcu/nocb: Atomic ->len field in rcu_segcblist structure

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Upcoming ->nocb_lock contention-reduction work requires that the
rcu_segcblist structure's ->len field be concurrently manipulated,
but only if there are no-CBs CPUs in the kernel.  This commit
therefore makes this ->len field be an atomic_long_t, but only
in CONFIG_RCU_NOCB_CPU=y kernels.

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

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This commit is contained in:

Paul E. McKenney 2019-07-01 17:36:53 -07:00

parent faca5c2509

commit eda669a6a2

3 changed files with 94 additions and 8 deletions

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4

include/linux/rcu_segcblist.h

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86

kernel/rcu/rcu_segcblist.c

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12

kernel/rcu/rcu_segcblist.h

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