linux-stable.git/kernel/rcu/tree.h, branch v4.20.2

rcu: Convert rcu_state.ofl_lock to raw_spinlock_t

2018-08-30T23:03:54+00:00

1e64b15a4b10 ("rcu: Fix grace-period hangs due to race with CPU offline")
added spinlock_t ofl_lock to the rcu_state structure, then takes it with
preemption disabled during CPU offline, which gives the -rt patchset's
sleeping spinlock heartburn.

This commit therefore converts ->ofl_lock to raw_spinlock_t.

Signed-off-by: Mike Galbraith 
Signed-off-by: Paul E. McKenney 
Cc: Sebastian Andrzej Siewior

rcu: Remove obsolete ->dynticks_fqs and ->cond_resched_completed

2018-08-30T23:03:53+00:00

The rcu_data structure's ->dynticks_fqs is incremented but never
accesses.  Its ->cond_resched_completed field isn't used at all.
This commit therefore removes both fields.

Signed-off-by: Paul E. McKenney

rcu: Switch ->dynticks to rcu_data structure, remove rcu_dynticks

2018-08-30T23:03:52+00:00

This commit move ->dynticks from the rcu_dynticks structure to the
rcu_data structure, replacing the field of the same name.  It also updates
the code to access ->dynticks from the rcu_data structure and to use the
rcu_data structure rather than following to now-gone ->dynticks field
to the now-gone rcu_dynticks structure.  While in the area, this commit
also fixes up comments.

Signed-off-by: Paul E. McKenney

rcu: Switch dyntick nesting counters to rcu_data structure

2018-08-30T23:03:51+00:00

This commit removes ->dynticks_nesting and ->dynticks_nmi_nesting from
the rcu_dynticks structure and updates the code to access them from the
rcu_data structure.

Signed-off-by: Paul E. McKenney

rcu: Switch urgent quiescent-state requests to rcu_data structure

2018-08-30T23:03:50+00:00

This commit removes ->rcu_need_heavy_qs and ->rcu_urgent_qs from the
rcu_dynticks structure and updates the code to access them from the
rcu_data structure.

Signed-off-by: Paul E. McKenney

rcu: Switch lazy counts to rcu_data structure

2018-08-30T23:03:49+00:00

This commit removes ->all_lazy, ->nonlazy_posted and ->nonlazy_posted_snap
from the rcu_dynticks structure and updates the code to access them from
the rcu_data structure.

Signed-off-by: Paul E. McKenney

rcu: Switch last accelerate/advance to rcu_data structure

2018-08-30T23:03:48+00:00

This commit removes ->last_accelerate and ->last_advance_all from the
rcu_dynticks structure and updates the code to access them from the
rcu_data structure.

Signed-off-by: Paul E. McKenney

rcu: Switch ->tick_nohz_enabled_snap to rcu_data structure

2018-08-30T23:03:47+00:00

This commit removes ->tick_nohz_enabled_snap from the rcu_dynticks
structure and updates the code to access it from the rcu_data
structure.

Signed-off-by: Paul E. McKenney

rcu: Merge rcu_dynticks structure into rcu_data structure

2018-08-30T23:03:47+00:00

Now that there is only ever one rcu_data structure per CPU, there is no
need for a separate rcu_dynticks structure.  This commit therefore adds
the rcu_dynticks fields into the rcu_data structure in preparation for
removing the rcu_dynticks structure entirely.  Note that the ->dynticks
field will be handled specially because there is a field by that name
in both structures.

Signed-off-by: Paul E. McKenney

rcu: Convert "1UL << x" to "BIT(x)"

2018-08-30T23:03:46+00:00

This commit saves a few characters by converting "1UL << x" to "BIT(x)".

Signed-off-by: Paul E. McKenney