rcu-tasks: Use order_base_2() instead of ilog2()

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The ilog2() function can be used to generate a shift count, but it will
generate the same count for a power of two as for one greater than a power
of two.  This results in shift counts that are larger than necessary for
systems with a power-of-two number of CPUs because the CPUs are numbered
from zero, so that the maximum CPU number is one less than that power
of two.

This commit therefore substitutes order_base_2(), which appears to have
been designed for exactly this use case.

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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This commit is contained in:

Paul E. McKenney 2022-02-02 15:42:36 -08:00

parent da123016ca

commit 2bcd18e041

1 changed files with 3 additions and 3 deletions

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kernel/rcu/tasks.h

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