rcu: Make ->cpu_no_qs be a union for aggregate OR

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This commit converts the rcu_data structure's ->cpu_no_qs field
to a union.  The bytewise side of this union allows individual access
to indications as to whether this CPU needs to find a quiescent state
for a normal (.norm) and/or expedited (.exp) grace period.  The setwise
side of the union allows testing whether or not a quiescent state is
needed at all, for either type of grace period.

For now, only .norm is used.  A later commit will introduce the expedited
usage.

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

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This commit is contained in:

Paul E. McKenney 2015-08-06 15:16:57 -07:00

parent 0d43eb34f9

commit 5b74c45890

4 changed files with 28 additions and 16 deletions

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22

kernel/rcu/tree.c

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14

kernel/rcu/tree.h

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6

kernel/rcu/tree_plugin.h

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2

kernel/rcu/tree_trace.c

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