linux-kernel - [PATCH RFC cpumask] Allow "all", "none", and "last" in cpumask strings

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Date:   Tue, 5 Jan 2021 16:48:50 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, yury.norov@...il.com,
        paul.gortmaker@...driver.com, kernel-team@...com
Subject: [PATCH RFC cpumask] Allow "all", "none", and "last" in cpumask
 strings

Hello!

This series allows "all", "none", and "last" to be used in cpumask
strings.  This allows these strings to be less dependent on the underlying
system.  For example, currently a string specifying all but the first
CPU must be "1-7" on an eight-CPU system and "1-15" on a 16-CPU system.
With this series, the single string "1-last" can be used regardless of the
number of CPUs (at least assuming that each system has at least one CPU).

1.	Un-inline cpulist_parse for SMP; prepare for ascii helpers,
	courtesy of Paul Gortmaker.

2.	Make "all" alias global and not just RCU, courtesy of Paul
	Gortmaker.

3.	Add a "none" alias to complement "all", courtesy of Paul
	Gortmaker.

4.	Add "last" alias for cpu list specifications, courtesy of Paul
	Gortmaker.

5.	Use "all" and "last" in "nohz_full" and "rcu_nocbs".

						Thanx, Paul

------------------------------------------------------------------------

 Documentation/admin-guide/kernel-parameters.rst            |   20 +
 Documentation/admin-guide/kernel-parameters.txt            |    4 
 include/linux/cpumask.h                                    |    8 
 kernel/rcu/tree_plugin.h                                   |   13 -
 lib/cpumask.c                                              |  136 ++++++++++++-
 tools/testing/selftests/rcutorture/configs/rcu/TREE04.boot |    2 
 tools/testing/selftests/rcutorture/configs/rcu/TREE08.boot |    2 
 7 files changed, 169 insertions(+), 16 deletions(-)