linux-kernel - Re: [PATCH v3] tty: tty_io: remove hung_up_tty

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Message-ID: <CAHk-=wi3iondeh_9V2g3Qz5oHTRjLsOpoy83hb58MVh=nRZe0A@mail.gmail.com>
Date: Wed, 1 May 2024 11:56:26 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: paulmck@...nel.org
Cc: Marco Elver <elver@...gle.com>, Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Dmitry Vyukov <dvyukov@...gle.com>, 
	syzbot <syzbot+b7c3ba8cdc2f6cf83c21@...kaller.appspotmail.com>, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	Nathan Chancellor <nathan@...nel.org>, Arnd Bergmann <arnd@...nel.org>, Al Viro <viro@...iv.linux.org.uk>, 
	Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH v3] tty: tty_io: remove hung_up_tty_fops

On Wed, 1 May 2024 at 11:46, Paul E. McKenney <paulmck@...nel.org> wrote:
>
> In short, I for one do greatly value KCSAN's help.  Along with that of
> a great many other tools, none of which are perfect, but all of which
> are helpful.

It's not that I don't value what KCSAN does, but I really think this
is a KCSAN issue.

I absolutely *detest* these crazy "randomly add data race annotations".

Could we instead annotate particular structure fields? I don't want to
mark things actually "volatile", because that then causes the compiler
to generate absolutely horrendous code. But some KCSAN equivalent of
"this field has data races, and we don't care" kind of annotation
would be lovely..

                 Linus