size_mul(9)

✨ size_mul(9) ✨

okay so bestie, this one is from the Kernel API Manual and it's genuinely such a little icon 💅 — it's all about multiplying two sizes together without letting things get out of hand.

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🌸 NAME 🌸

size_mul — calculates a size_t multiplication, saturating at SIZE_MAX 🎀

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🦋 SYNOPSIS 🦋

size_t size_mul (size_t factor1 , size_t factor2 );

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💖 ARGUMENTS 💖

• factor1 — the first factor, bestie 🌸
• factor2 — the second factor, obviously 💅

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⭐ RETURN ⭐

So it calculates factor1 * factor2, with both of them promoted to size_t, and like… if any overflow happens, the return value becomes SIZE_MAX instead. No cap, it just caps out. 👑

Also lowkey important: the lvalue must be size_t so you don't get any implicit type conversion sneaking in. Don't do it, bestie — type conversion jumpscare 😭

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🌈 SEE ALSO 🌈

Kernel file ./tools/include/linux/overflow.h, plus these iconic siblings: array_size(9), array3_size(9), struct_size(9) 🫶

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and that's the whole vibe, fr fr ✨ this page came from ./tools/include/linux, dated October 2026 — slay, go forth and multiply (safely) 💜🎀