cpumask_any(9)

💅 cpumask_any(9) — like, the Kernel API Manual page, bestie ✨

okay so real talk, this is a page from the Kernel API Manual and it's genuinely so simple you're gonna be obsessed. it's cpumask_any and it does exactly one thing but it does it flawlessly. no notes. 🎀

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✨ NAME ✨

cpumask_any — pick an arbitrary cpu from *srcp

like... any cpu. whoever shows up. it's giving "you get a cpu, you get a cpu" energy 🦋

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🌸 SYNOPSIS 🌸

cpumask_any (srcp );

literally that's it. that's the whole vibe check. 💅

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🎀 ARGUMENTS 🎀

• srcp — the input cpumask 💖 this is the little squad of cpus you're handing over, and the function is gonna pick one out of the group. no cap.

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🦋 RETURN 🦋

returns >= nr_cpu_ids if no cpus set. 😭

bestie please hear me on this one: if your mask is empty (nobody's home, zero cpus set), you don't get a cpu, you get a value that's >= nr_cpu_ids — so like, always check, okay? don't just assume you got a valid cpu back. 🙈

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🌈 SEE ALSO 🌈

okay this is the part where the page goes absolutely feral with the cross-references, and honestly? iconic. the source file is ./include/linux/cpumask.h and here is the entire friend group, not one of them skipped, periodt 👑

• 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_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), to_cpumask(9), num_online_cpus(9), cpumap_print_bitmask_to_buf(9), cpumap_print_list_to_buf(9)

iykyk 💜

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and that's the whole page, bestie — go pick a cpu, slay, and remember: empty mask means no cpu for you 😤🫶

with love from ./include/linux · October 2026 · the cpumask_any(9) girlies 💅✨