smp_text_poke_batch_finish(9)

💖 smp_text_poke_batch_finish(9) 💖

okay bestie, welcome to the Kernel API Manual entry for smp_text_poke_batch_finish(9) — it’s giving “finish the live-kernel instruction-patching batch on SMP” energy, and honestly? iconic. 🫶✨

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🌸 NAME 🌸

<pink>smp_text_poke_batch_finish</pink> — update instructions on live kernel on SMP. 💅

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🎀 SYNOPSIS 🎀

void smp_text_poke_batch_finish (void );

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💅 ARGUMENTS 💅

• void — no arguments. literally none, bestie. 🫶

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🦋 DESCRIPTION 🦋

Input state, so you know what we’re working with:

• text_poke_array.vec — vector of instructions to patch.
• text_poke_array.nr_entries — number of entries in the vector.

This function modifies multi-byte instructions by using INT3 breakpoints on SMP. We completely avoid using stop_machine here, and achieve the synchronization using INT3 breakpoints and SMP cross-calls. no cap. 🔥

The way it is done:

• For each entry in the vector:
  • add an INT3 trap to the address that will be patched
  • SMP sync all CPUs
• For each entry in the vector:
  • update all but the first byte of the patched range
  • SMP sync all CPUs
• For each entry in the vector:
  • replace the first byte (INT3) by the first byte of the replacing opcode
  • SMP sync all CPUs

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🔥 SEE ALSO 🔥

Kernel file ./arch/x86/kernel/alternative.c — go check out text_poke_early(9), text_poke(9), text_poke_kgdb(9), text_poke_copy(9), text_poke_set(9), smp_text_poke_batch_add(9), and smp_text_poke_single(9). iykyk 💜

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that’s the whole page, bestie — source/version: ./arch/x86/kernel · date: October 2026. mwah 💋✨