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 X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=BAYES_00,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0CB8C4167B for ; Fri, 11 Dec 2020 10:47:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A80F723F38 for ; Fri, 11 Dec 2020 10:47:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393177AbgLKKr1 (ORCPT ); Fri, 11 Dec 2020 05:47:27 -0500 Received: from mail-lj1-f195.google.com ([209.85.208.195]:42496 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728980AbgLKKrK (ORCPT ); Fri, 11 Dec 2020 05:47:10 -0500 Received: by mail-lj1-f195.google.com with SMTP id y22so10330435ljn.9; Fri, 11 Dec 2020 02:46:54 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=dRa8+8T0/doCyxO8jlNrqWF9bR8w4xPSvOc8mqFfidI=; b=GkRjOyByop67mPZU4KBxErD+xT3KiaTuGG7uCIK0ryjWFi9hPqCQ7Pvh9tNv9lP1Bw nMFUqpKle557p+AUjs0HNXh4kDwuRwJj5R+XSRj0P56znTQpZggEMKAhdZ99eIKzqSpF copzuAbs7km5xmG1yiZMAef4WKdOfE67qZr/9UphfJoHGtBhNdeRjZM6Hk8g9lmmovnl qS0aWH+v0hRjeinpFQKgvRUh8C0an8C8HEhKI0ZYyHuUrltpzJkmL/Gpvj6h8NSs8Mss W/EeL8M0bTLxGJk3Q+B/2PTZhaO7tMY6pFeiD3GLNc+xpjjUZKzpGZyU/ynAYBuvHzR5 p45A== X-Gm-Message-State: AOAM532oXhB2COuR9g+txsdXjI7bHtGJo1MljXivmGQTL+DkPJq/Ebn4 HBg6KBWBBaUBPinfqIV7rqM= X-Google-Smtp-Source: ABdhPJx0eK75XvUevDCsmqYfr+BPwS23tljwjADb07jfuaNvnTNuvi5wcgR9UGvhacHo3upAiIqEgw== X-Received: by 2002:a05:651c:1199:: with SMTP id w25mr4642238ljo.165.1607683588903; Fri, 11 Dec 2020 02:46:28 -0800 (PST) Received: from xi.terra (c-d2ade455.07-184-6d6c6d4.bbcust.telenor.se. [85.228.173.210]) by smtp.gmail.com with ESMTPSA id o8sm841166lft.101.2020.12.11.02.46.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Dec 2020 02:46:28 -0800 (PST) Received: from johan by xi.terra with local (Exim 4.93.0.4) (envelope-from ) id 1knfwR-0000u7-Eq; Fri, 11 Dec 2020 11:46:27 +0100 Date: Fri, 11 Dec 2020 11:46:27 +0100 From: Johan Hovold To: Greg Kroah-Hartman Cc: Maarten Brock , Mychaela Falconia , Johan Hovold , Jiri Slaby , "Mychaela N . Falconia" , linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 0/7] tty: add flag to suppress ready signalling on open Message-ID: References: <20201202113942.27024-1-johan@kernel.org> <6b81cca21561305b55ba8f019b78da28@vanmierlo.com> <3fc3097ce1d35ce1e45fa5a3c7173666@vanmierlo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 10, 2020 at 02:01:30PM +0100, Greg Kroah-Hartman wrote: > O_DIRECT is an interesting hack, has anyone seen if it violates the > posix rules for us to use it on a character device like this? Jiri only mentioned O_DIRECT as an example of a flag which we might be able to repurpose/abuse for this. O_DIRECT is linux-specific, not in POSIX, so we'd still end up with a Linux-specific interface if we were to take this route. Johan