rcu: Pull out wait_event*() condition into helper function

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The condition for the wait_event_interruptible_timeout() that waits
to do the next force-quiescent-state scan is a bit ornate:

	((gf = READ_ONCE(rsp->gp_flags)) &
	 RCU_GP_FLAG_FQS) ||
	(!READ_ONCE(rnp->qsmask) &&
	 !rcu_preempt_blocked_readers_cgp(rnp))

This commit therefore pulls this condition out into a helper function
and comments its component conditions.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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This commit is contained in:

Paul E. McKenney 2015-07-01 13:50:28 -07:00

parent 99a930b0d2

commit b9a425cfcb

1 changed files with 21 additions and 5 deletions

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kernel/rcu/tree.c

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