kernel/linux.git/include/linux/cpumask.h, branch v6.18.21

Merge tag 'bitmap-for-6.17' of https://github.com/norov/linux

2025-07-31T23:52:32+00:00

Pull bitmap updates from Yury Norov: - find_random_bit() series (Yury) - GENMASK() consolidation (Vincent) - random cleanups (Shaopeng, Ben, Yury) * tag 'bitmap-for-6.17' of https://github.com/norov/linux: bitfield: Ensure the return values of helper functions are checked test_bits: add tests for __GENMASK() and __GENMASK_ULL() bits: unify the non-asm GENMASK*() bits: split the definition of the asm and non-asm GENMASK*() cpumask: Remove unnecessary cpumask_nth_andnot() watchdog: fix opencoded cpumask_next_wrap() in watchdog_next_cpu() clocksource: Improve randomness in clocksource_verify_choose_cpus() cpumask: introduce cpumask_random() bitmap: generalize node_random()

cpumask: Remove unnecessary cpumask_nth_andnot()

2025-07-31T15:28:03+00:00

Commit 94f753143028("x86/resctrl: Optimize cpumask_any_housekeeping()") switched the only user of cpumask_nth_andnot() to other cpumask functions, but left the function cpumask_nth_andnot() unused. This makes function find_nth_andnot_bit() unused as well. Delete them. Signed-off-by: Shaopeng Tan Signed-off-by: Yury Norov [NVIDIA]

cpumask: introduce cpumask_random()

2025-07-08T23:11:57+00:00

Propagate find_random_bit() to cpumask API. CC: Andrew Morton Signed-off-by: "Yury Norov [NVIDIA]"

cpumask: add cpumask_clear_cpus()

2025-06-26T09:19:15+00:00

When user wants to clear a range in cpumask, the only option the API provides now is a for-loop, like: for_each_cpu_from(cpu, mask) { if (cpu >= ncpus) break; __cpumask_clear_cpu(cpu, mask); } In the bitmap API we have bitmap_clear() for that, which is significantly faster than a for-loop. Propagate it to cpumasks. Signed-off-by: Yury Norov [NVIDIA] Link: https://patch.msgid.link/20250604193947.11834-2-yury.norov@gmail.com Signed-off-by: Leon Romanovsky

Merge tag 'bitmap-for-6.16-rc1' of https://github.com/norov/linux

2025-06-03T14:39:23+00:00

Pull bitmap updates from Yury Norov: - dead code cleanups for cpumasks and nodemasks (me) - fixed-width flavors of GENMASK() and BIT() (Vincent, Lucas and me) - FIELD_MODIFY() helper (Luo) - for_each_node_with_cpus() optimization (me) - bitmap-str fixes (Andy) * tag 'bitmap-for-6.16-rc1' of https://github.com/norov/linux: topology: make for_each_node_with_cpus() O(N) bitfield: Add FIELD_MODIFY() helper bitmap-str: Add missing header(s) bitmap-str: Get rid of 'extern' for function prototypes build_bug.h: more user friendly error messages in BUILD_BUG_ON_ZERO() test_bits: add tests for BIT_U*() test_bits: add tests for GENMASK_U*() drm/i915: Convert REG_GENMASK*() to fixed-width GENMASK_U*() bits: introduce fixed-type BIT_U*() bits: introduce fixed-type GENMASK_U*() bits: add comments and newlines to #if, #else and #endif directives cpumask: drop cpumask_assign_cpu() riscv: switch set_icache_stale_mask() to using non-atomic assign_cpu() cpumask: add non-atomic __assign_cpu() nodemask: drop nodes_shift

cpumask: Add cpumask_{first,next}_andnot() API

2025-05-15T18:28:12+00:00

With the lack of the functions, client code has to abuse less efficient cpumask_nth(). Signed-off-by: Yury Norov [NVIDIA] Signed-off-by: James Morse Signed-off-by: Borislav Petkov (AMD) Reviewed-by: James Morse Reviewed-by: Reinette Chatre Reviewed-by: Fenghua Yu Tested-by: Fenghua Yu Tested-by: James Morse Tested-by: Tony Luck Link: https://lore.kernel.org/20250515165855.31452-4-james.morse@arm.com

cpumask: Relax cpumask_any_but()

2025-05-15T18:24:22+00:00

Similarly to other cpumask search functions, accept -1, and consider it as 'any CPU' hint. This helps users to avoid coding special cases. Signed-off-by: Yury Norov [NVIDIA] Signed-off-by: James Morse Signed-off-by: Borislav Petkov (AMD) Reviewed-by: James Morse Reviewed-by: Reinette Chatre Reviewed-by: Fenghua Yu Tested-by: James Morse Tested-by: Tony Luck Tested-by: Fenghua Yu Link: https://lore.kernel.org/20250515165855.31452-2-james.morse@arm.com

cpumask: drop cpumask_assign_cpu()

2025-04-29T19:58:38+00:00

Commit decde1fa209323c7 ("cpumask: Add assign cpu") was merged bypassing cpumasks reviewers. It adds atomic and non-atomic cpumask_assign_cpu() helpers. In the same merge window, commit 5c563ee90a22d3 ("cpumask: introduce assign_cpu() macro") added the same functionality. So now we have it duplicated. __cpumask_assign_cpu() has never been used since introducing, and because this series reworks the only user of cpumask_assign_cpu(), both functions become a dead code. Signed-off-by: Yury Norov [NVIDIA]

cpumask: add non-atomic __assign_cpu()

2025-04-29T19:58:37+00:00

Similarly to atomic, add a non-atomic version. Signed-off-by: Yury Norov [NVIDIA]

cpumask: align text in comment

2025-03-20T21:33:31+00:00

Since commit 4e1a7df45480 ("cpumask: Add enabled cpumask for present CPUs that can be brought online") introduced cpu_enabled_mask, the comment line describing the mask has been slightly out of alignment with the adjacent lines. Fix this by removing a single space character. Signed-off-by: Joel Savitz Signed-off-by: Yury Norov