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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 B366BC3A589 for ; Thu, 15 Aug 2019 15:50:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 891E520665 for ; Thu, 15 Aug 2019 15:50:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b="PKP9EOU3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728413AbfHOPu4 (ORCPT ); Thu, 15 Aug 2019 11:50:56 -0400 Received: from terminus.zytor.com ([198.137.202.136]:52655 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726008AbfHOPu4 (ORCPT ); Thu, 15 Aug 2019 11:50:56 -0400 Received: from [IPv6:2601:646:8600:3281:591e:e77:65e1:9db1] ([IPv6:2601:646:8600:3281:591e:e77:65e1:9db1]) (authenticated bits=0) by mail.zytor.com (8.15.2/8.15.2) with ESMTPSA id x7FFo2e82401331 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO); Thu, 15 Aug 2019 08:50:04 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 mail.zytor.com x7FFo2e82401331 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2019071901; t=1565884208; bh=rZVtSKWKJMYaNqQAqv7vBDcXZkR10Vw+m7flZizgKig=; h=Date:In-Reply-To:References:Subject:To:CC:From:From; b=PKP9EOU3UYbYSGImxe+UPWqDyYAZXTZe+MMNowVHnkuaETdwk6L/yrF9pstKMeHak /Q2Anr2bsSO0g7boKn1A6o6Mw0c5INMZgSBvtr7Cb6pT2m1tTs+88Netipp17KDn6I 5lL1hrXp9Cw5VOteRpseX4e9K3HHagDCRgYtHcnNxp772Y+U0OZ1IJ1NcrSXehEGFm kvU9Ml2AvClG5MlIE2Q4OlGdoeZEosxINH12prwicZTPj4l7MZVm1yQvRq1Ms5Bm7a TVYKhH2MkGOGSfiqfU6+bxQiPGghZgoj+N/wT5F7Q5/DjZpR4sUU3GOjJuq+FjQWZ6 bDobhTpMGYdyg== Date: Thu, 15 Aug 2019 08:24:09 -0700 User-Agent: K-9 Mail for Android In-Reply-To: <20190815150530.GA18727@mit.edu> References: <20190814000622.GB20365@mit.edu> <342565604d704b6ebaf2e9ec28d3e109@AcuMS.aculab.com> <0089C4CC-DD85-48A1-869B-A9D71852BEC7@zytor.com> <20190815150530.GA18727@mit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: New kernel interface for sys_tz and timewarp? To: "Theodore Y. Ts'o" , Arnd Bergmann CC: David Laight , Linus Torvalds , Linux Kernel Mailing List , Thomas Gleixner , John Stultz , Alexandre Belloni , Stephen Boyd , Florian Weimer , Palmer Dabbelt , Alistair Francis , GNU C Library , Karel Zak , Lennart Poettering , OGAWA Hirofumi From: hpa@zytor.com Message-ID: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On August 15, 2019 8:05:30 AM PDT, "Theodore Y=2E Ts'o" w= rote: >On Thu, Aug 15, 2019 at 03:22:45PM +0200, Arnd Bergmann wrote: >> If 64-bit Windows relies on a working EFI RTC implementation, we >could >> decide to leave the driver enabled on 64-bit and only disable it for >> 32-bit EFI=2E That way, future distros would no longer have to worry >about >> the localtime hack, at least the ones that have dropped support for >> 32-bit x86 kernels=2E > >=2E=2E=2E and who have also dropped support for legacy (non-UEFI) 64-bit >boot=2E Keep in mind that even for distributions which may install with >UEFI by default, if people have been upgrading from (for example) >Debian Jessie to Stretch to Buster, they may still be using non-UEFI >boot=2E This might be especially true on small Linode servers (such as, >for example, the one which is currently running my mail smarthost=2E=2E= =2E=2E) > > - Ted There is also the ACPI TAD device, which can be used to expose this throug= h ACPI=2E We might also be able to request that the ACPI information for th= e RTC be augmented with a CMOS timezone location=2E --=20 Sent from my Android device with K-9 Mail=2E Please excuse my brevity=2E