rcu: Disable run-time single-CPU grace-period optimization

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The run-time single-CPU grace-period optimization applies only to
kernels built with CONFIG_SMP=y && CONFIG_PREEMPTION=y that are running
on a single-CPU system.  But a kernel intended for a single-CPU system
should instead be built with CONFIG_SMP=n, and in any case, single-CPU
systems running Linux no longer appear to be the common case.  Plus this
optimization results in the rcu_gp_oldstate structure being half again
larger than it needs to be.

This commit therefore disables the run-time single-CPU grace-period
optimization, so that this optimization applies only during the
pre-scheduler portion of the boot sequence.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Paul E. McKenney 2022-08-04 16:07:04 -07:00

parent 8df13f0160

commit 258f887aba

1 changed files with 9 additions and 31 deletions

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kernel/rcu/tree.c

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