wrapping_mul(9)

okay so welcome to wrapping_mul from the Kernel API Manual, bestie — this is the intentionally-on-purpose multiplication moment and I’m obsessed 💅✨

✨ NAME ✨

wrapping_mul is literally Intentionally perform a wrapping multiplication 😌. That’s the assignment. It’s giving “yes I know it wraps, I meant that” energy, and honestly? Iconic.

💻 SYNOPSIS 💻

the call looks like this, copy it exactly:

wrapping_mul (type , a , b );

🎀 ARGUMENTS 🎀

• type — type for result of calculation, no cap 🫶
• a — first factor 🍓
• b — second factor 🍓

two factors, one type, all accounted for 💖

🌸 DESCRIPTION 🌸

Return the potentially wrapped-around multiplication without tripping any wrap-around sanitizers that may be enabled. That’s the whole vibe: you get the multiplication, it may wrap around, and the sanitizers that may be enabled do not get tripped. Periodt. 💅

🦋 SEE ALSO 🦋

Kernel file ./include/linux/overflow.h is the home base for this whole friend group 🫶. Full guest list, no skips:

• check_add_overflow(9), wrapping_add(9), wrapping_assign_add(9), check_sub_overflow(9), wrapping_sub(9), wrapping_assign_sub(9)
• check_mul_overflow(9), check_shl_overflow(9), overflows_type(9), range_overflows(9), range_overflows_t(9), range_end_overflows(9), range_end_overflows_t(9), castable_to_type(9)
• size_mul(9), size_add(9), size_sub(9), array_size(9), array3_size(9), flex_array_size(9), struct_size(9), struct_size_t(9), struct_offset(9)
• __DEFINE_FLEX(9), _DEFINE_FLEX(9), DEFINE_RAW_FLEX(9), DEFINE_FLEX(9), STACK_FLEX_ARRAY_SIZE(9), typeof_flex_counter(9), overflows_flex_counter_type(9), __set_flex_counter(9)

source/version: ./include/linux · date: October 2026 · page: wrapping_mul(9) — bye bestie, go multiply on purpose 💅✨