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[2604:1380:45d1:ec00::1]) by mx.google.com with ESMTPS id u136-20020a81848e000000b005d7fb8a80f7si3163831ywf.138.2023.12.05.06.06.12 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Dec 2023 06:06:12 -0800 (PST) Received-SPF: pass (google.com: domain of linux-nfs+bounces-333-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b="u1Gv/QaA"; spf=pass (google.com: domain of linux-nfs+bounces-333-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) smtp.mailfrom="linux-nfs+bounces-333-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 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bh=xDYFyEAHpriyg7I1pK3/gQb6BqegWY0SWpBCpUJIgi8=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=u1Gv/QaAXW9tldncpZPoheHc26SThdWg9O0bnAW+dUTqrOgUhWOdmiiCnfyUpFAKu 2BcU0GHV7Kj7NfJLDTfzzJWNjJDeATgT23A8ZEmXwlagYVRSXY7Qj05WosexPtB/MK VJsUt9W93eKdGiNjFqys/l8c4U0POZU++htwMuO583T9mwWsfUk9J+H/EeDsLwp+ns NxLDkAqIzqvtJncfUPlPbMOTxXVGyhL4FIdexQWeOK6IOnq6e4rcHkAJyaNvi5RgAR dkEF5pnSP+TH8JmfvZGnkzKNmzS+Y6XlM2FD2iuOSKfFI6S7KcrR2xejj4am446p9f P3lfNR749idZw== Message-ID: Subject: Re: [PATCH 1/2] Allow a kthread to declare that it calls task_work_run() From: Jeff Layton To: Christian Brauner , Jens Axboe Cc: NeilBrown , Al Viro , Oleg Nesterov , Chuck Lever , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org Date: Tue, 05 Dec 2023 09:06:05 -0500 In-Reply-To: <20231205-altbacken-umbesetzen-e5c0c021ab98@brauner> References: <20231204014042.6754-1-neilb@suse.de> <20231204014042.6754-2-neilb@suse.de> 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.1 (3.50.1-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2023-12-05 at 12:14 +0100, Christian Brauner wrote: > On Mon, Dec 04, 2023 at 03:09:44PM -0700, Jens Axboe wrote: > > On 12/4/23 2:02 PM, NeilBrown wrote: > > > It isn't clear to me what _GPL is appropriate, but maybe the rules > > > changed since last I looked..... are there rules? > > >=20 > > > My reasoning was that the call is effectively part of the user-space > > > ABI. A user-space process can call this trivially by invoking any > > > system call. The user-space ABI is explicitly a boundary which the G= PL > > > does not cross. So it doesn't seem appropriate to prevent non-GPL > > > kernel code from doing something that non-GPL user-space code can > > > trivially do. > >=20 > > By that reasoning, basically everything in the kernel should be non-GPL > > marked. And while task_work can get used by the application, it happens > > only indirectly or implicitly. So I don't think this reasoning is sound > > at all, it's not an exported ABI or API by itself. > >=20 > > For me, the more core of an export it is, the stronger the reason it > > should be GPL. FWIW, I don't think exporting task_work functionality is > > a good idea in the first place, but if there's a strong reason to do so= , >=20 > Yeah, I'm not too fond of that part as well. I don't think we want to > give modules the ability to mess with task work. This is just asking for > trouble. The fact that nfsd has to queue all of the delayed fput activity to a workqueue has always been a horrible hack though. We export all kinds of functionality to modules that you can screw up. I think that nfsd's use-case is legitimate. ksmbd may also want to follow suit. --=20 Jeff Layton