linux-kernel - Re: [PATCH] uprobe: Do not use UPROBE_SWBP

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Date: Thu, 20 Jun 2024 21:38:46 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>, Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH] uprobe: Do not use UPROBE_SWBP_INSN as static initializer

On 06/20, Andrii Nakryiko wrote:
>
> Can we instead ask loongarch folks to rewrite it to be a constant?
> Having this as a function call is both an inconvenience and potential
> performance problem (a minor one, but still). I would imagine it's not
> hard to hard-code an instruction as a constant here.

I was going to ask the same question when I saw the bug report ;)
The same for other users of larch_insn_gen_break().

But I can't understand what does it do, it calls emit_break() and
git grep -w emit_break finds nothing.

Oleg.