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List:       linux-kernel
Subject:    Re: [PATCH v3] tty: tty_io: remove hung_up_tty_fops
From:       Linus Torvalds <torvalds () linux-foundation ! org>
Date:       2024-05-04 17:50:29
Message-ID: CAHk-=whz-pFHfC4nNdrBtWs4KOm7Q2d2quHmFFYzz1Dz7d7LnQ () mail ! gmail ! com
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On Fri, 3 May 2024 at 22:08, Paul E. McKenney <paulmck@kernel.org> wrote:
>
> You are right, this is going to need some arch-specific code for a few
> of the architectures.  Hey, I was hoping!!!
>
> The compilers do not currently optimize these things, but things appear
> to me to be heading in that direction.

Ok, so it sounds like right now it makes no sense - presumably
__atomic_load_n() doesn't actually generate better code than
READ_ONCE() does as-is, and we have the issue with having to make it
per-architecture anyway.

But maybe in a couple of years we can revisit this when / if it
actually generates better code and is more widely applicable.

            Linus

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