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

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Message-ID: <20231214152740.24d01893@gandalf.local.home>
Date: Thu, 14 Dec 2023 15:27:40 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.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 15:19:11 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> For this issue of the 64bit cmpxchg, is there any config that works for any
> arch that do not have a safe 64-bit cmpxchg? At least for 486, is the
> second half of the if condition reasonable?
> 
> 	if (IS_ENABLED(CONFIG_X86_32) && !IS_ENABLED(CONFIG_X86_CMPXCHG64)) {
> 		if (unlikely(in_nmi()))
> 			return NULL;
> 	}

Ignore this, I'm now reading your other email. I'll have more questions there.

-- Steve