linux-kernel - Re: [PATCH v3] ring-buffer: Remove 32bit timestamp logic

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Message-ID: <CAHk-=wjHf48o15sugNeZkzNy2sJ2XUjaJLUWskTB0FnrnFGDeA@mail.gmail.com>
Date: Thu, 14 Dec 2023 12:32:38 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>, 
	Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
	Linux Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v3] ring-buffer: Remove 32bit timestamp logic

On Thu, 14 Dec 2023 at 12:30, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Read my email. Don't do random x86-centric things. We have that
>
>   #ifndef system_has_cmpxchg64
>       #define system_has_cmpxchg64() false
>   #endif
>
> which should work.

And again, by "should work" I mean that it would disable this entirely
on things like arm32 until the arm people decide they care. But at
least it won't use an unsafe non-working 64-bit cmpxchg.

And no, for 6.7, only fix reported bugs. No big reorgs at all,
particularly for something that likely has never been hit by any user
and sounds like this all just came out of discussion.

              Linus