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. Could you please check to make sure that I didn't mess anything up? 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 >
