On Tue, Jan 5, 2021 at 4:48 PM Paul E. McKenney <paul...@kernel.org> wrote: > > 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).
'none' may be implemented as an empty string or string with separators only, but I have nothing against explicit 'none'. See other comments inline. Thanks, Yury. > 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(-)
