From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4002D368276 for ; Thu, 11 Jun 2026 07:43:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781163837; cv=none; b=q28Mnf/e5AeLurO29m3ePU4XjzBiCD1/n97JkQtHhO7kw/BxdCrp2I+QM/9vxUtu4ULUQkv5rTQ5/ZBVb8idA+GiDb+lbEATJvazxCZ+osnsUbJnoLUxQPFcoXnfxKCLymS9YZzmKmAPH23UipS2j9MdPUz/VrI01q99wseeIT8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781163837; c=relaxed/simple; bh=eQh+ZjPQJ/wvBQWmGoL6TQ7im3YvXzDP++Dr+x9ZdJs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=O6VTIzmJNQ9M1SBtWARKEJEWJ+OuAGIszAk9aQ1ri4dG3vFUppEawQQ9cvNoe3kilJrvmYuDWZrA004MZS4DPCVeVEUubSe6JlV39HMQBvRzCflRrxnu7mwd5hroJA606fy3f3RuZhQX50H0TGj1m0oi3zsGJN/VgLh4c0KiKmY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=pass smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=bkzBc3Gf; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="bkzBc3Gf" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=eQh+ZjPQJ/wvBQWmGoL6TQ7im3YvXzDP++Dr+x9ZdJs=; b=bkzBc3GfcXcMY/f57c1qZuU41I 1N+/GbOFpp4RYqBR0CA1PLONq56quSUNxz7ft+maZ+66xz3OlvT8+QQpXxSiO3oi2HY36OmxTpCtw ka2WErw9SFJF3/yfH+L9qgggC9b1yAropW5CWuUIuk614SahfeSrVKRCnlP8wsJocFy0GVFA0+J0m YASbqcHc7L2zqruZ67cZaxW3LjLQNFszCNXSW/HarKE9vqKSkzzcHMCPFQWcDw81z6tj0pcBsduk1 PGnLP0KDl8aj4qwQkEsAoYeH0p/e5dNHfc7tX6x2gjyfkIydj91Roluw8QtoyuTKEg1IBw/UoUPaz is/xLosQ==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wXa4n-00000001TdB-2DBN; Thu, 11 Jun 2026 07:43:46 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id C911E302FEF; Thu, 11 Jun 2026 09:43:44 +0200 (CEST) Date: Thu, 11 Jun 2026 09:43:44 +0200 From: Peter Zijlstra To: Rik van Riel Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, vschneid@redhat.com Subject: Re: [PATCH 0/9] sched: make WARN_ON under rq->lock deadlock-safe (SCHED_WARN_ON) Message-ID: <20260611074344.GG48970@noisy.programming.kicks-ass.net> References: <20260611021416.910555-1-riel@surriel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260611021416.910555-1-riel@surriel.com> Sorry, no. I've said it before and I'll stick with it. Just no. printk_deferred() is an abomination, it means that if you mess up the machine properly you'll *NEVER* see the output. As per always, printk() is the one that needs fixing, and IIRC they were very close to getting there.