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Date: Wed, 24 Jun 2026 11:31:17 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	sched-ext@lists.linux.dev, netdev@vger.kernel.org,
	"David S . Miller" <davem@davemloft.net>,
	Andrea Righi <arighi@nvidia.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Arnd Bergmann <arnd@arndb.de>, Ben Segall <bsegall@google.com>,
	Breno Leitao <leitao@debian.org>,
	Changwoo Min <changwoo@igalia.com>,
	David Vernet <void@manifault.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Eric Dumazet <edumazet@google.com>, Ingo Molnar <mingo@redhat.com>,
	Jakub Kicinski <kuba@kernel.org>,
	John Ogness <john.ogness@linutronix.de>,
	Juri Lelli <juri.lelli@redhat.com>,
	K Prateek Nayak <kprateek.nayak@amd.com>,
	Paolo Abeni <pabeni@redhat.com>, Petr Mladek <pmladek@suse.com>,
	Sergey Senozhatsky <senozhatsky@chromium.org>,
	Simon Horman <horms@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>, Tejun Heo <tj@kernel.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Vlad Poenaru <vlad.wing@gmail.com>
Subject: Re: [PATCH 1/2] bug: Provide WARN_ON.*DEFERRED() macros for console
 deferred output
Message-ID: <20260624093117.GY48970@noisy.programming.kicks-ass.net>
References: <20260623142650.265721-1-bigeasy@linutronix.de>
 <20260623142650.265721-2-bigeasy@linutronix.de>
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In-Reply-To: <20260623142650.265721-2-bigeasy@linutronix.de>

On Tue, Jun 23, 2026 at 04:26:49PM +0200, Sebastian Andrzej Siewior wrote:

> +#ifndef WARN_ON_DEFERRED
> +#define WARN_ON_DEFERRED(condition) ({					\
> +	int __ret_warn_on = !!(condition);				\
> +	if (unlikely(__ret_warn_on)) {					\
> +		guard(preempt)();					\
> +		printk_deferred_enter()					\
> +		__WARN();						\
> +		printk_deferred_exit()					\
> +	}								\
> +	unlikely(__ret_warn_on);					\
> +})
> +#endif

This will generate atrocious shite at the WARN sites.