FIELD_PREP_CONST(9)

✨ FIELD_PREP_CONST(9) ✨

okay so bestie, welcome to the Kernel API Manual page for FIELD_PREP_CONST(9) — the one that prepares a constant bitfield element 💅

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🌸 NAME 🌸

FIELD_PREP_CONST — prepare a constant bitfield element ✨

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🎀 SYNOPSIS 🎀

FIELD_PREP_CONST (_mask , _val );

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🦋 ARGUMENTS 🦋

• _mask — the shifted mask that defines the field’s length and position 👑
• _val — the value you’re putting in the field 🫶

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💖 DESCRIPTION 💖

FIELD_PREP_CONST masks and shifts up the value. The result should be combined with other fields of the bitfield using logical OR — yes, that part matters, slay 🔥

Unlike FIELD_PREP, this is a constant expression and can therefore be used in initializers. Periodt. ✨

ngl the error checking is less comfortable for this version, and non-constant masks cannot be used. So keep that in mind, bestie 😭

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🌈 SEE ALSO 🌈

Kernel file: ./include/linux/bitfield.h

Also check out FIELD_MAX(9), FIELD_FIT(9), FIELD_PREP(9), FIELD_GET(9), FIELD_GET_SIGNED(9), FIELD_MODIFY(9), field_prep(9), and field_get(9) 🧚

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Byeee bestie — this iconic little page comes from the ./include/linux source/version and is dated October 2026 💜🎀