On Wed, Apr 21, 2021 at 10:30:08AM -0700, Paul E. McKenney wrote: > On Tue, Apr 20, 2021 at 08:13:24PM -0700, Yury Norov wrote: > > RCU code supports a special group 'all' which selects all bits in a bitmap. > > We have recently added 'N' extension for bitmap parse, so that '0-N' would > > have exactly the same meaning as 'all'. But because the 'all' is already > > used by RCU, it would be reasonable to support it in core bitmap code as a > > common and easy-readable alias for '0-N'. > > > > Moving the 'all' support to core bitmap code adds another level of > > flexibility for system configuration by supporting patterns. For example, > > every second bit in cpumask may be selected like this: > > isolcpus=all:1/2 > > > > v2: > > - cleanup patch 1; > > - in patch 2 explain why dropping legacy comment. > > Nice! > > I have pulled this into -rcu with some minor updates, including replacing > the "isolcpus=all" with "rcu_nocbs=all:1/2" per Steve Rostedt's feedback. Thank you Paul and Steven for fixing this 'isolcpus=all'. 'rcu_nocbs=all:1/2' would look better in the documentation. > Could you please check to make sure that I didn't mess anything up? Everything is OK. Thank you for fixing this. > If tests go well, this will go into -next later today or tomorrow. > Although I cannot prove that this will not make the upcoming merge window, > but Murphy insists that it will instead be the v5.14 merge window. > > Thanx, Paul > > > Yury Norov (2): > > bitmap_parse: support 'all' semantics > > rcu/tree_plugin: don't handle the case of 'all' CPU range > > > > Documentation/admin-guide/kernel-parameters.rst | 5 +++++ > > kernel/rcu/tree_plugin.h | 9 +++------ > > lib/bitmap.c | 9 +++++++++ > > lib/test_bitmap.c | 7 +++++++ > > 4 files changed, 24 insertions(+), 6 deletions(-) > > > > -- > > 2.25.1 > >
