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

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Date: Tue, 13 Feb 2024 13:58:37 +0100
From: Andrea Parri <parri.andrea@...il.com>
To: Samuel Holland <samuel.holland@...ive.com>
Cc: Palmer Dabbelt <palmer@...belt.com>, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org, 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,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Björn Töpel <bjorn@...osinc.com>
Subject: Re: [PATCH 0/7] riscv: Various text patching improvements

Hi Samuel,

On Sun, Feb 11, 2024 at 06:55:11PM -0800, Samuel Holland wrote:
> 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.
> 
> 
> 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()

This does look like a nice clean-up.  Just curious (a "teach me"-like question),
how did you test these changes? kselftests, micro-benchmarks, other?

BTW, I recall a parallel work from Alex and Bjorn [1] that might have some minor
conflict with these changes; + both of them to Cc: for further sync.

  Andrea

[1] https://lore.kernel.org/lkml/20240206204607.527195-1-alexghiti@rivosinc.com/