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rcu: Rename struct rcu_gp_oldstate to rcu_gp_seq

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The polled grace-period state structure rcu_gp_oldstate holds a snapshot
of the normal (and, on SMP, expedited) grace-period sequence numbers.
Upcoming changes store this structure in the callback segment list, where
the "oldstate" name reads poorly: there it represents the grace period a
segment is waiting on and is also compared against the current
grace-period state.

Rename struct rcu_gp_oldstate to the more neutral struct rcu_gp_seq, and
shorten its members rgos_norm and rgos_exp to norm and exp.  Local
variables and parameters of this type are renamed from rgosp/rgos to
gsp/gs accordingly.

While at it, provide a single definition of the structure in rcupdate.h
rather than separate Tiny-RCU and Tree-RCU definitions, and give it the
->exp field unconditionally.  Tiny RCU does not track expedited grace
periods and leaves ->exp unused, but a single definition that always has
->exp lets the shared callback code in rcu_segcblist.c reference it
without CONFIG_SMP guards, including on !SMP builds.

No functional change.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Puranjay Mohan 2026-06-24 06:23:43 -07:00 • committed by Paul E. McKenney
commit 736084507f
9 changed files with 100 additions and 100 deletions
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