linux-kernel - [PATCH v2 0/7] riscv: Various text patching improvements

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Message-ID: <20240327160520.791322-1-samuel.holland@sifive.com>
Date: Wed, 27 Mar 2024 09:04:39 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>
Cc: Björn Töpel <bjorn@...osinc.com>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Samuel Holland <samuel.holland@...ive.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jason Baron <jbaron@...mai.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	bpf@...r.kernel.org
Subject: [PATCH v2 0/7] riscv: Various text patching improvements

Here are a few changes to minimize calls to stop_machine() and
flush_icache_*() in the various text patching functions, as well as
to simplify the code.

This series is based on "[PATCH v3 0/2] riscv: fix patching with IPI"[1].

[1]: https://lore.kernel.org/linux-riscv/20240229121056.203419-1-alexghiti@rivosinc.com/

Changes in v2:
 - Remove unnecessary line wrapping
 - Further simplify patch_insn_set()/patch_insn_write() loop conditions
 - Use min() instead of min_t() since both sides are unsigned long

Samuel Holland (7):
  riscv: jump_label: Batch icache maintenance
  riscv: jump_label: Simplify assembly syntax
  riscv: kprobes: Use patch_text_nosync() for insn slots
  riscv: Simplify text patching loops
  riscv: Pass patch_text() the length in bytes
  riscv: Use offset_in_page() in text patching functions
  riscv: Remove extra variable in patch_text_nosync()

 arch/riscv/include/asm/jump_label.h |  4 +-
 arch/riscv/include/asm/patch.h      |  2 +-
 arch/riscv/kernel/jump_label.c      | 16 +++++--
 arch/riscv/kernel/patch.c           | 69 ++++++++++++++---------------
 arch/riscv/kernel/probes/kprobes.c  | 19 ++++----
 arch/riscv/net/bpf_jit_comp64.c     |  7 +--
 6 files changed, 63 insertions(+), 54 deletions(-)

-- 
2.43.1