cpumap_print_bitmask_to_buf(9)

💅 cpumap_print_bitmask_to_buf — from the Kernel API Manual, bestie ✨

okay so picture this: you've got a cpumask, right? and you've got a buffer. and you need the mask in the buffer, as hex. that's literally the whole gig. this lil function is the one who does it. 🫶

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✨ NAME ✨

cpumap_print_bitmask_to_buf — copies the cpumask into the buffer as hex values of cpumask

no cap, that's it. that's the job description. 💖

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🎀 SYNOPSIS 🎀

ssize_t cpumap_print_bitmask_to_buf (char *buf , const struct cpumask
*mask , loff_t off , size_t count );

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🌸 ARGUMENTS 🌸

• buf — the buffer to copy into. this is the destination, the vibe, the place where the hex ends up. 🎯
• mask — the cpumask to copy. the main character of this entire operation, honestly. 👑
• off — in the string from which we are copying, we copy to buf. like, you're picking up mid-string and dropping it in. 📍
• count — the maximum number of bytes to print. the limit. the budget. don't exceed it. 💀

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🦋 DESCRIPTION 🦋

The function prints the cpumask into the buffer as hex values of cpumask — yep, hex. not a list, not a range, hex. 🧚

Typically used by bin_attribute to export cpumask bitmask ABI. so like, that's its whole little niche and it's thriving in it. it's giving "specialist". ✨

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🔥 RETURN 🔥

the length of how many bytes have been copied, excluding terminating ' '. so you know exactly how much you got. 💅 ngl that's genuinely useful of it.

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/cpumask.h — and like, the entire extended cpumask cinematic universe, fr fr:

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

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okay that's the whole page, you ate that 💅💖

tiny sign-off from the very bottom of the page: this one lives in ./include/linux, and the page is dated October 2026 — cpumap_print_bitmask_to_buf(9), iconic, no notes. 🎀✨