DEFINE_PRINTKRB(9)

okay so bestie 💖 we’re looking at DEFINE_PRINTKRB(9) from the Kernel API Manual, and it’s literally a macro moment — let’s get into it, no cap.

🌸 NAME 🌸

DEFINE_PRINTKRB — Define a ringbuffer.

✨ SYNOPSIS ✨

DEFINE_PRINTKRB (name , descbits , avgtextbits );

🎀 ARGUMENTS 🎀

• name — The name of the ringbuffer variable. iconic, honestly.
• descbits — The number of descriptors as a power-of-2 value.
• avgtextbits — The average text data size per record as a power-of-2 value.

💅 DESCRIPTION 💅

This is a macro for defining a ringbuffer and all internal structures such that it is ready for immediate use. fr fr, it sets the whole thing up.

If you need a variant where the text data buffer can be specified externally, go look at _DEFINE_PRINTKRB — that’s the one, bestie. 🫶

lowkey important: this page is about DEFINE_PRINTKRB, and _DEFINE_PRINTKRB is the externally-specified-text-buffer variant. don’t mix them up 💅

🌈 SEE ALSO 🌈

• Kernel file ./kernel/printk/printk_ringbuffer.h
• prb_rec_init_wr(9)
• prb_rec_init_rd(9)
• prb_for_each_record(9)
• prb_for_each_info(9)

mwah 💋 source/version is ./kernel/printk, dated October 2026, and this is the DEFINE_PRINTKRB(9) page — that’s the whole vibe, bye bestie 🫶