cpumap_print_list_to_buf(9)

💅 cpumap_print_list_to_buf — Kernel API Manual ✨

okay bestie, welcome to the Kernel API Manual corner of the universe, where we take a cpumask and squish it into a buffer as a comma-separated list of cpus 🎀 this one is genuinely so useful and I need you to be seated for it 💖

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🌸 NAME 🌸

cpumap_print_list_to_buf — copies the cpumask into the buffer as comma-separated list of cpus ✨

like, it takes your mask and writes it out all pretty with commas between the cpu numbers. icon behavior honestly 👑

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🦋 SYNOPSIS 🦋

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

four args, one ssize_t coming back, no cap 🫶

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💜 ARGUMENTS 💜

• buf — the buffer to copy into 🫙 like this is where the text lands, bestie
• mask — the cpumask to copy 👀 the actual cpu situation we're printing out
• off — in the string from which we are copying, we copy to buf ⭐ that's the offset into the string we're reading from
• count — the maximum number of bytes to print 🚦 the hard cap, do not exceed, periodt

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🔥 DESCRIPTION 🔥

Everything is same with the above cpumap_print_bitmask_to_buf except the print format 💅

that's literally it — same everything, different format. the list format instead of the bitmask format. main character energy but make it comma-separated 🌈

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⭐ RETURN ⭐

returns the length of how many bytes have been copied, excluding terminating ' ' ✨

so yeah, count what actually got copied, and that terminating ' ' is not included in the number, bestie 🙈

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🧚 SEE ALSO 🧚

Kernel file ./include/linux/cpumask.h — and honestly the whole cpumask friend group showed up, so let's give them their moment 💖

• 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)
• and ofc the sibling that started it all: cpumap_print_bitmask_to_buf(9) 😭

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ok that's the whole page, nothing skipped, everything intact, we ate and left no crumbs 🍓

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and that's a wrap bestie!! this little page lives in ./include/linux and it's stamped October 2026 — so it's giving very much future-fresh 🔥 go print some cpus, you're gonna slay 💅💖🦋