linux-kernel - [PATCH tip/core/rcu 0/9] Add bitmap (thus CPU) ranges

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Date:   Wed, 3 Mar 2021 15:55:26 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org,
        paul.gortmaker@...driver.com
Subject: [PATCH tip/core/rcu 0/9] Add bitmap (thus CPU) ranges

Hello!

This series adds ranges to bitmaps, and thus to CPU numbers, so that a
kernel boot parameter such as "rcu_nocbs=2-N" is now permitted.

1.	test_bitmap: clearly separate ERANGE from EINVAL tests, courtesy
	of Paul Gortmaker.

2.	test_bitmap: add tests to trigger ERANGE case, courtesy of
	Paul Gortmaker.

3.	test_bitmap: add more start-end:offset/len tests, courtesy of
	Paul Gortmaker.

4.	bitmap: fold nbits into region struct, courtesy of Paul Gortmaker.

5.	bitmap: move ERANGE check from set_region to check_region,
	courtesy of Paul Gortmaker.

6.	bitmap: support "N" as an alias for size of bitmap, courtesy of
	Paul Gortmaker.

7.	test_bitmap: add tests for "N" alias, courtesy of Paul Gortmaker.

8.	deprecate "all" option to rcu_nocbs=, courtesy of Paul Gortmaker.

9.	Use "all" and "N" in "nohz_full" and "rcu_nocbs".

						Thanx, Paul

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

 Documentation/admin-guide/kernel-parameters.rst            |    7 +
 Documentation/admin-guide/kernel-parameters.txt            |    4 
 kernel/rcu/tree_plugin.h                                   |    6 -
 lib/bitmap.c                                               |   55 +++++++------
 lib/test_bitmap.c                                          |   46 +++++++++-
 tools/testing/selftests/rcutorture/configs/rcu/TREE04.boot |    2 
 tools/testing/selftests/rcutorture/configs/rcu/TREE08.boot |    2 
 7 files changed, 84 insertions(+), 38 deletions(-)