linux-kernel - Re: Inlining migrate_disable/enable. Was: [PATCH bpf-next v2 02/18] x86,bpf: add bpf_global

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Message-ID: <20250716182414.GI4105545@noisy.programming.kicks-ass.net>
Date: Wed, 16 Jul 2025 20:24:14 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Menglong Dong <menglong.dong@...ux.dev>,
	Menglong Dong <menglong8.dong@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>, Jiri Olsa <jolsa@...nel.org>,
	bpf <bpf@...r.kernel.org>, Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: Inlining migrate_disable/enable. Was: [PATCH bpf-next v2 02/18]
 x86,bpf: add bpf_global_caller for global trampoline

On Wed, Jul 16, 2025 at 09:56:11AM -0700, Alexei Starovoitov wrote:

> Maybe Peter has better ideas ?

Is it possible to express runqueues::nr_pinned as an alias?

extern unsigned int __attribute__((alias("runqueues.nr_pinned"))) this_nr_pinned;

And use:

	__this_cpu_inc(&this_nr_pinned);


This syntax doesn't actually seem to work; but can we construct
something like that?

Google finds me this:

 https://gcc.gnu.org/pipermail/gcc-help/2012-February/109877.html