cpumask_or(9)

💅 cpumask_or(9) — the Kernel API Manual, but make it make sense ✨

okay so bestie, welcome to the group chat 🫶 this one lives in the Kernel API Manual and it is genuinely one of the cutest little helpers in ./include/linux/cpumask.h — it's giving "bitwise OR but make it CPU masks" and honestly? obsessed. 💖

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✨ NAME ✨

cpumask_or — the whole entire vibe is literally this:

*dstp = *src1p | *src2p

no cap, that's it, that's the function. 💅

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🌸 SYNOPSIS 🌸

void cpumask_or (struct cpumask *dstp , const struct cpumask *src1p ,
       const struct cpumask *src2p );

it returns void bestie, so don't go looking for a return value, it's not coming 🔥 the result goes into *dstp and that's the whole plot.

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🎀 ARGUMENTS 🎀

• dstp — the cpumask result 💫 this is where the answer lands, she's the main character of this operation, the output slot, the one who gets written to. periodt.
• src1p — the first input 🌸 one half of the OR, read-only, const, she is not being modified today.
• src2p — the second input 🦋 the other half of the OR, also const, also just here to be read and combined. iconic behaviour honestly.

so like… dstp gets src1p | src2p and everyone else stays exactly as they were. no drama, no side effects on the sources, we love a clean bitwise moment ✨

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💜 SEE ALSO 💜

literally the entire cpumask cinematic universe, iykyk 👑

• Kernel file ./include/linux/cpumask.h: 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_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), to_cpumask(9), num_online_cpus(9), cpumap_print_bitmask_to_buf(9), cpumap_print_list_to_buf(9)

like i said. the whole universe. go read them. slay. 🔥

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ngl if you only remember one thing: dstp gets the OR of src1p and src2p, nothing more, nothing less. no cap. 💖

okay bye bestie, this page came from ./include/linux and it's dated October 2026, so yeah, freshly stamped and ready for you 🎀💅✨