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=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, 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 7727EC433E3 for ; Thu, 16 Jul 2020 19:24:33 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id C48C32074B for ; Thu, 16 Jul 2020 19:24:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="MoeXRncz" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C48C32074B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-19362-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 9643 invoked by uid 550); 16 Jul 2020 19:24:26 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 9611 invoked from network); 16 Jul 2020 19:24:25 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=IO5rF0v38hkORnZpPQ2np7PkHTT7l3o2Frf1znSvMCA=; b=MoeXRnczoJvOTiX060NRDer3ic+Z0a6OAKDDzvlghJHJsuwLM+IhpBPYCW1h0hZNZh Fr5kyGgY0/SatP2EZptwciRkxUEZBeWULPC9tbngCSgNOCvd0NXvOeL8OmnqU6ynZicD iZLZdIgB2wXCD8oLjuasdEEdCIEAfOKV/ccMk= 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=IO5rF0v38hkORnZpPQ2np7PkHTT7l3o2Frf1znSvMCA=; b=EpJxtSbwOmovIvJgsZPBrMfW+pgRx1YD6e3thk89nf+8tVlqcpsIU1NX00dyoG9Bl9 7KdFuw+Fkj7qNl3lHmNfQLKqjQtOeEFwOAxCa8PX+/gFGmKQN8GOuPoZYlWKsz/1JWht sHohGTqu0rdSR9pgW77KsrKsgR3h/vk5x/23j7pBbm3IC60QZNFZby3tiyQyWL6WC6lO jOyak3FTza4zmM0eFnv8KDVT+cqrMEvd3kfHL7kdY1lG0q5ufOiVQ73NTJjF7PnChkA9 z+/438BhOie2AO3S282NH0xqzvA2v1M2ZYSqd+JzWXUSVJHOKYzQTMgYgR8xobJmGMnB eFTw== X-Gm-Message-State: AOAM531U8lkhctlim16CbFBF9RLKMBcv7yYXbTuSlPboOOck7QeMIfFp yS07N4nlBrgBKusPw57F48WVVQ== X-Google-Smtp-Source: ABdhPJy0sUnqF9h52WMr6418CCHExwqoVmt3MmuGhwouhxSV6Mqarvy7mOWSh3mLcM/3Qo2Kub5J7g== X-Received: by 2002:a17:90a:d30c:: with SMTP id p12mr6742185pju.4.1594927454098; Thu, 16 Jul 2020 12:24:14 -0700 (PDT) Date: Thu, 16 Jul 2020 12:24:12 -0700 From: Kees Cook To: Sebastian Andrzej Siewior Cc: Peter Zijlstra , Greg Kroah-Hartman , Thomas Gleixner , Allen Pais , Oscar Carter , Romain Perier , Dmitry Torokhov , Kevin Curtis , "David S. Miller" , Jakub Kicinski , Harald Freudenberger , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Jiri Slaby , Felipe Balbi , Jason Wessel , Daniel Thompson , Douglas Anderson , Mitchell Blank Jr , Julian Wiedmann , Karsten Graul , Ursula Braun , Jaroslav Kysela , Takashi Iwai , Christian Gromm , Nishka Dasgupta , Masahiro Yamada , Stephen Boyd , "Matthew Wilcox (Oracle)" , Wambui Karuga , Guenter Roeck , Chris Packham , Kyungtae Kim , Kuppuswamy Sathyanarayanan , "Rafael J. Wysocki" , Jonathan Corbet , Will Deacon , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-s390@vger.kernel.org, devel@driverdev.osuosl.org, linux-usb@vger.kernel.org, kgdb-bugreport@lists.sourceforge.net, alsa-devel@alsa-project.org, kernel-hardening@lists.openwall.com Subject: Re: [PATCH 0/3] Modernize tasklet callback API Message-ID: <202007161223.19FB352B5@keescook> References: <20200716030847.1564131-1-keescook@chromium.org> <20200716075718.GM10769@hirez.programming.kicks-ass.net> <20200716081538.2sivhkj4hcyrusem@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200716081538.2sivhkj4hcyrusem@linutronix.de> On Thu, Jul 16, 2020 at 10:15:38AM +0200, Sebastian Andrzej Siewior wrote: > On 2020-07-16 09:57:18 [+0200], Peter Zijlstra wrote: > > > > there appear to be hardly any users left.. Can't we stage an extinction > > event here instead? > > Most of the time the tasklet is scheduled from an interrupt handler. So > we could get rid of these tasklets by using threaded IRQs. Perhaps I can add a comment above the tasklet API area in interrupt.h? -- Kees Cook