Messages in this thread | | | From | Yury Norov <> | Subject | [PATCH 0/5] lib/find: add find_nth_bit() | Date | Wed, 6 Jul 2022 11:22:55 -0700 |
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Kernel lacks for a function that searches for Nth bit in a bitmap. Usually people do it like this: for_each_set_bit(bit, mask, size) if (--n == 0) return bit;
Which is not so elegant, and very slow.
This series adds fast routines for this task, and applies them where appropriate.
While here, move thin wrappers around find_bit() in nodemask.c to a corresponding header, and because nodemask.c is empty after that, remove it.
On top of "lib: cleanup bitmap-related headers": https://lkml.org/lkml/2022/7/6/1202
Yury Norov (5): lib: add find_nth(,and,andnot)_bit() lib/bitmap: add tests for find_nth_bit() remove bitmap_ord_to_pos cpumask: add cpumask_nth_{,and,andnot} lib/nodemask: inline next_node_in() and node_random()
MAINTAINERS | 1 - include/linux/bitmap.h | 1 - include/linux/bitops.h | 19 ++++++++++ include/linux/cpumask.h | 44 ++++++++++++++++++++++ include/linux/find.h | 79 ++++++++++++++++++++++++++++++++++++++++ include/linux/nodemask.h | 27 +++++++++++--- lib/Makefile | 2 +- lib/bitmap.c | 36 ++---------------- lib/cpumask.c | 26 ++++++------- lib/find_bit.c | 20 ++++++++++ lib/find_bit_benchmark.c | 17 +++++++++ lib/nodemask.c | 31 ---------------- lib/test_bitmap.c | 36 +++++++++++++++++- 13 files changed, 250 insertions(+), 89 deletions(-) delete mode 100644 lib/nodemask.c
-- 2.34.1
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