rcu: Eliminate __rcu_pending() false positives

Now that there are both ->gpnum and ->completed fields in the
rcu_node structure, __rcu_pending() should check rdp->gpnum and
rdp->completed against rnp->gpnum and rdp->completed, respectively,
instead of the prior comparison against the rcu_state fields
rsp->gpnum and rsp->completed.

Given the old comparison, __rcu_pending() could return 1, resulting
in a needless raise_softirq(RCU_SOFTIRQ).  This useless work would
happen if RCU responded to a scheduling-clock interrupt after the
rcu_state fields had been updated, but before the rcu_node fields
had been updated.

Changing the comparison from the rcu_state fields to the rcu_node
fields prevents this useless work from happening.

Signed-off-by: Paul E. McKenney <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
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Cc: [email protected]
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Cc: [email protected]
LKML-Reference: <12581706991966-git-send-email->
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions