linux-kernel - Re: [PATCH] x86/alternatives: remove false sharing in poke_int3

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Message-ID: <20250325123119.GL36322@noisy.programming.kicks-ass.net>
Date: Tue, 25 Mar 2025 13:31:19 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: Eric Dumazet <edumazet@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Masami Hiramatsu <mhiramat@...nel.org>, x86@...nel.org,
	bpf@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>,
	Greg Thelen <gthelen@...gle.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] x86/alternatives: remove false sharing in
 poke_int3_handler()

On Tue, Mar 25, 2025 at 12:26:36PM +0100, Ingo Molnar wrote:

> Yeah, so I do know what #BP is, but what the heck disambiguates the two 
> meanings of _bp and why do we have the above jungle of an inconsistent 
> namespace? :-)
> 
> Picking _int3 would neatly solve all of that.

Sure; the most obvious case where BP would make sense, the trap entry
point, we already use int3 so yeah, make it int3 throughout.