rcu: Finish folding ->fqs_state into ->gp_state

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Commit commit 4cdfc175c2 ("rcu: Move quiescent-state forcing
into kthread") started the process of folding the old ->fqs_state into
->gp_state, but did not complete it.  This situation does not cause
any malfunction, but can result in extremely confusing trace output.
This commit completes this task of eliminating ->fqs_state in favor
of ->gp_state.

The old ->fqs_state was also used to decide when to collect dyntick-idle
snapshots.  For this purpose, we add a boolean variable into the kthread,
which is set on the first call to rcu_gp_fqs() for a given grace period
and clear otherwise.

Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

...

This commit is contained in:

Petr Mladek 2015-09-09 12:09:49 -07:00 • committed by Paul E. McKenney

parent 49f5903b47

commit 77f81fe08e

3 changed files with 12 additions and 22 deletions

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18

kernel/rcu/tree.c

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14

kernel/rcu/tree.h

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2

kernel/rcu/tree_trace.c

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