to_cpumask(9)

✨ NAME ✨

okay so welcome to to_cpumask(9) from the Kernel API Manual 💅 — it converts a NR_CPUS bitmap into a struct cpumask *, and honestly? iconic behavior.

🌸 SYNOPSIS 🌸

to_cpumask (bitmap );

🎀 ARGUMENTS 🎀

• bitmap — the bitmap. that's the vibe check, bestie.

🦋 DESCRIPTION 🦋

okay so here's the lore: there are a few places where cpumask_var_t isn't appropriate and static cpumasks must be used (eg. very early boot), but we don't expose the definition of struct cpumask. awkward? a little. main character energy? absolutely.

to_cpumask does the conversion, and it can be used as a constant initializer. slay.

🔥 SEE ALSO 🔥

Kernel file ./include/linux/cpumask.h — and bestie, the whole cpumask squad is linked:

• cpumask_pr_args(9)
• cpumask_first(9)
• cpumask_first_zero(9)
• cpumask_first_and(9)
• cpumask_first_andnot(9)
• cpumask_first_and_and(9)
• cpumask_last(9)
• cpumask_next(9)
• cpumask_next_zero(9)
• cpumask_next_and(9)
• cpumask_next_andnot(9)
• cpumask_next_and_wrap(9)
• cpumask_next_wrap(9)
• cpumask_random(9)
• for_each_cpu(9)
• for_each_cpu_wrap(9)
• for_each_cpu_and(9)
• for_each_cpu_andnot(9)
• for_each_cpu_or(9)
• for_each_cpu_from(9)
• cpumask_any_but(9)
• cpumask_any_and_but(9)
• cpumask_any_andnot_but(9)
• cpumask_nth(9)
• cpumask_nth_and(9)
• cpumask_nth_and_andnot(9)
• cpumask_set_cpu(9)
• cpumask_clear_cpus(9)
• cpumask_clear_cpu(9)
• cpumask_test_cpu(9)
• cpumask_test_and_set_cpu(9)
• cpumask_test_and_clear_cpu(9)
• cpumask_setall(9)
• cpumask_clear(9)
• cpumask_and(9)
• cpumask_or(9)
• cpumask_weighted_or(9)
• cpumask_xor(9)
• cpumask_andnot(9)
• cpumask_equal(9)
• cpumask_or_equal(9)
• cpumask_intersects(9)
• cpumask_subset(9)
• cpumask_empty(9)
• cpumask_full(9)
• cpumask_weight(9)
• cpumask_weight_and(9)
• cpumask_weight_andnot(9)
• cpumask_shift_right(9)
• cpumask_shift_left(9)
• cpumask_copy(9)
• cpumask_any(9)
• cpumask_any_and(9)
• cpumask_of(9)
• cpumask_parse_user(9)
• cpumask_parselist_user(9)
• cpumask_parse(9)
• cpulist_parse(9)
• cpumask_size(9)
• alloc_cpumask_var(9)
• num_online_cpus(9)
• cpumap_print_bitmask_to_buf(9)
• cpumap_print_list_to_buf(9)

k bye bestie 🫶 this page is signed off from ./include/linux, dated October 2026 — to_cpumask(9) out 💖