From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 829ABEF8FF0 for ; Wed, 4 Mar 2026 14:51:54 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4fQwc84wZnz3btw; Thu, 05 Mar 2026 01:51:52 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=213.95.11.211 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1772635912; cv=none; b=QUPQdjqMQjuEB8ySY7a1g5CIne1GjjhBUJlY6n380/kgVg+YYZPs9O0AcCA30XeFciTCc2Ws+D1iSfPHsmjVcAmOEUggarjEcVBvbKCDVj9Tw69AJEvn+uBSdP9RN5qeHBKvzK7WZBbJo5pujyFwdoedzPIlf60jCEzgK8MuMQFE7yaOoHEvM3+iF239UyEcNwoY3tzrbuv79yejORMzPnSH5zx66Cim7rhSwdbq26U9kvWzeFMSrgWNkflezo86YzDWNJwWYfljNRKqB270gfLOKxLTmnLoyZo1SbDaUn/icO3JPuNg6ANulVgefl9UtAqXy2htd9TDDMGvSUMhrw== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1772635912; c=relaxed/relaxed; bh=7OwA86SnZzNUGB3TVCWM5+M7FjnAjt0P/s/l7EZvY0k=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=O7YXEfFkcO2a7BnENQg6G/71T5NDCtu42zEcqQ3pj4HzjMzXzr66MvB5msZwP++Q0tURGYdfNawZQruOXLLc4ICpANDZOao8iX+l6CEWFoZdJJpaGH9KNQucMa5USwnes6UuYFoH98VFVNHzq2jNE0Gcb1Hf8P5vnsSTeX3GnDWiEoNtm3rSIWSljHbvGzG9bnjtox5aiBAbAT9lrFVr/MAzMlAnP4e+DErX6VBb2lgNpvb+csiBcDY746o+wpG3GFvIj/xbNxwfXm+I9YOByydQkqJ1CjuptgWnMH9/K048Zx5QAB7ixduh4Hdua5MZAcsjXVGTO8YNAfd4ZRn8fA== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=lst.de; spf=pass (client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver=lists.ozlabs.org) smtp.mailfrom=lst.de Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=lst.de Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lst.de (client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver=lists.ozlabs.org) Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4fQwc75zkCz3btg for ; Thu, 05 Mar 2026 01:51:50 +1100 (AEDT) Received: by verein.lst.de (Postfix, from userid 2407) id 23B5068AFE; Wed, 4 Mar 2026 15:51:35 +0100 (CET) Date: Wed, 4 Mar 2026 15:51:34 +0100 From: Christoph Hellwig To: Eric Biggers Cc: Christoph Hellwig , Peter Zijlstra , Andrew Morton , Richard Henderson , Matt Turner , Magnus Lindholm , Russell King , Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "David S. Miller" , Andreas Larsson , Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Herbert Xu , Dan Williams , Chris Mason , David Sterba , Arnd Bergmann , Song Liu , Yu Kuai , Li Nan , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-crypto@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-arch@vger.kernel.org, linux-raid@vger.kernel.org Subject: Re: [PATCH 01/25] xor: assert that xor_blocks is not called from interrupt context Message-ID: <20260304145134.GA21983@lst.de> References: <20260226151106.144735-1-hch@lst.de> <20260226151106.144735-2-hch@lst.de> <20260227142455.GG1282955@noisy.programming.kicks-ass.net> <20260303160050.GB7021@lst.de> <20260303195517.GC2846@sol> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260303195517.GC2846@sol> User-Agent: Mutt/1.5.17 (2007-11-01) On Tue, Mar 03, 2026 at 11:55:17AM -0800, Eric Biggers wrote: > may_use_simd() is the "generic" way to check "can the FPU/vector/SIMD > registers be used". However, what it does varies by architecture, and > it's kind of a questionable abstraction in the first place. It's used > mostly by architecture-specific code. Yeah, I don't think that is quite right here. > How about "WARN_ON_ONCE(!preemptible())"? I think that covers the union > of the context restrictions correctly. (Compared to in_task(), it > handles the cases where hardirqs or softirqs are disabled.) Good enough I guess. Peter?