linux-kernel - Re: [GIT PULL] tracing: Prevent trace_marker being bigger than unsigned short

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Message-ID: <CAHk-=wioeo5vyEWUZcGBKMsf3jnjrnnHc3uJiV=JjSKPdvZOEw@mail.gmail.com>
Date: Sat, 2 Mar 2024 12:55:10 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Sachin Sant <sachinp@...ux.ibm.com>
Subject: Re: [GIT PULL] tracing: Prevent trace_marker being bigger than
 unsigned short

On Sat, 2 Mar 2024 at 12:47, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> I'm fine with just making it 4K with a comment saying that "4K is the
> minimum page size on most archs, and to keep this consistent for crazy
> architectures like PowerPC and it's 64K pages, we hard code 4K to keep
> all architectures acting the same".

4k is at least a somewhat sane limit, and yes, being hw-independent is
a good idea.

We have other strings that have that limit for similar reasons (ie PATH_MAX).

                Linus