From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x2253r6X8in9eYUKYigmLZTewneALRPaqB80PBhN25pjR8hSTvOezRnVBMb1ROEBghnm9LhZy ARC-Seal: i=1; a=rsa-sha256; t=1518391616; cv=none; d=google.com; s=arc-20160816; b=w0PNVMgaevZFZYSu0+pf1i3SD119kCJdaQSKFTpFifbz/PkTk7BbMg/wS1mpamxjbk Nn6bYQxh6uMjo7CuAnVBblnfC317Sjafra9JpwTFJ3Zf8vlNPdyXiqcUp1MBe07cujo1 XmlpUUdbv6QyCbH2SfMkwQ4ABqsirGJWnsi8eD3O59aI01LYcN2+daE/IHS09G6Djyzd FQ6+y255HeSYmTERhmYlDnv1/Mh2jZ6qkAcigUEeo8jGuuK7nNbxTipibGFjRO7qRrvW 7mv6LD/HaA7ma1FH4nd1QoOkOJR8FfDO/4ePHwn3Pswk+0XaTiTEWtlSQtyJulq+olM9 O13w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:organization:references :in-reply-to:message-id:subject:cc:to:from:date :arc-authentication-results; bh=m7oy4X60h1XNzDkQVKfCMtKwSz4HUz8uYIJpwLXNMiA=; b=PHLfWgIP7c70nYa8sB+PJgsWWzf28LtwWxlkWNf7cbmCnao9urkPo2rU2n6hKcfYCh 9SB8LVQGjmcEKDsqas1fGzs8PK3gj5tEskiVRMQTAgZLdYD2TRwKRYufh3nwDwU8OCvW l4qSVUXTgRsF2Rtpz/z52gAigxAfjjqjB4vWZ+npTDH5SwR3/DC+IS2Dkt5x4DPkgi+2 I0qAax6NtTwPWaXRNp4id/fZauiE72s+De/CvZNexBy6hJpelKoeqylHLenKXz9E+teG tQ106qm9A4P1ogdLnqqNr5eYvhyfYjlKDCBp1Y+d/7D/M1Y95GpyLvEr4RBAI0nlxJfW C9ZA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of gnomes@lxorguk.ukuu.org.uk designates 82.70.14.225 as permitted sender) smtp.mailfrom=gnomes@lxorguk.ukuu.org.uk Authentication-Results: mx.google.com; spf=pass (google.com: domain of gnomes@lxorguk.ukuu.org.uk designates 82.70.14.225 as permitted sender) smtp.mailfrom=gnomes@lxorguk.ukuu.org.uk Date: Sun, 11 Feb 2018 23:25:56 +0000 From: Alan Cox To: Andy Lutomirski Cc: Mark D Rustad , Adam Borowski , Linus Torvalds , Joerg Roedel , Andy Lutomirski , Joerg Roedel , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , X86 ML , LKML , Linux-MM , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , "Liguori, Anthony" , Daniel Gruss , Hugh Dickins , Kees Cook , Andrea Arcangeli , Waiman Long , Pavel Machek Subject: Re: [PATCH 00/31 v2] PTI support for x86_32 Message-ID: <20180211232556.1fdde355@alans-desktop> In-Reply-To: <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net> References: <1518168340-9392-1-git-send-email-joro@8bytes.org> <20180209191112.55zyjf4njum75brd@suse.de> <20180210091543.ynypx4y3koz44g7y@angband.pl> <20180211105909.53bv5q363u7jgrsc@angband.pl> <6FB16384-7597-474E-91A1-1AF09201CEAC@gmail.com> <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net> Organization: Intel Corporation X-Mailer: Claws Mail 3.15.1-dirty (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1591914900490843452?= X-GMAIL-MSGID: =?utf-8?q?1592149007473309773?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Sun, 11 Feb 2018 11:42:47 -0800 Andy Lutomirski wrote: > On Feb 11, 2018, at 9:40 AM, Mark D Rustad wrote: > > >> On Feb 11, 2018, at 2:59 AM, Adam Borowski wrote: > >> > >>> Does Debian make it easy to upgrade to a 64-bit kernel if you have a > >>> 32-bit install? > >> > >> Quite easy, yeah. Crossgrading userspace is not for the faint of the heart, > >> but changing just the kernel is fine. > > > > ISTR that iscsi doesn't work when running a 64-bit kernel with a 32-bit userspace. I remember someone offered kernel patches to fix it, but I think they were rejected. I haven't messed with that stuff in many years, so perhaps the userspace side now has accommodation for it. It might be something to check on. > > > > At the risk of suggesting heresy, should we consider removing x86_32 support at some point? Probably - although it's still relevant for Quark. I can't think of any other in-production 32bit only processor at this point. Big core Intel went 64bit 2006 or so, atoms mostly 2008 or so (with some stragglers that are 32 or 64 bit depending if it's enabled) until 2011 (Cedartrail) If someone stuck a fork in it just after the next long term kernel release then by the time that expired it would probably be historical interest only. Does it not depend if there is someone crazy enough to maintain it however - 68000 is doing fine 8) Alan From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f199.google.com (mail-wr0-f199.google.com [209.85.128.199]) by kanga.kvack.org (Postfix) with ESMTP id 0A2196B0003 for ; Sun, 11 Feb 2018 18:26:55 -0500 (EST) Received: by mail-wr0-f199.google.com with SMTP id 30so7936780wrw.6 for ; Sun, 11 Feb 2018 15:26:54 -0800 (PST) Received: from fuzix.org (www.llwyncelyn.cymru. [82.70.14.225]) by mx.google.com with ESMTPS id m21si2815875wmd.265.2018.02.11.15.26.53 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 11 Feb 2018 15:26:53 -0800 (PST) Date: Sun, 11 Feb 2018 23:25:56 +0000 From: Alan Cox Subject: Re: [PATCH 00/31 v2] PTI support for x86_32 Message-ID: <20180211232556.1fdde355@alans-desktop> In-Reply-To: <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net> References: <1518168340-9392-1-git-send-email-joro@8bytes.org> <20180209191112.55zyjf4njum75brd@suse.de> <20180210091543.ynypx4y3koz44g7y@angband.pl> <20180211105909.53bv5q363u7jgrsc@angband.pl> <6FB16384-7597-474E-91A1-1AF09201CEAC@gmail.com> <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andy Lutomirski Cc: Mark D Rustad , Adam Borowski , Linus Torvalds , Joerg Roedel , Andy Lutomirski , Joerg Roedel , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , X86 ML , LKML , Linux-MM , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , "Liguori, Anthony" , Daniel Gruss , Hugh Dickins , Kees Cook , Andrea Arcangeli , Waiman Long , Pavel Machek On Sun, 11 Feb 2018 11:42:47 -0800 Andy Lutomirski wrote: > On Feb 11, 2018, at 9:40 AM, Mark D Rustad wrote: > > >> On Feb 11, 2018, at 2:59 AM, Adam Borowski wrote: > >> > >>> Does Debian make it easy to upgrade to a 64-bit kernel if you have a > >>> 32-bit install? > >> > >> Quite easy, yeah. Crossgrading userspace is not for the faint of the heart, > >> but changing just the kernel is fine. > > > > ISTR that iscsi doesn't work when running a 64-bit kernel with a 32-bit userspace. I remember someone offered kernel patches to fix it, but I think they were rejected. I haven't messed with that stuff in many years, so perhaps the userspace side now has accommodation for it. It might be something to check on. > > > > At the risk of suggesting heresy, should we consider removing x86_32 support at some point? Probably - although it's still relevant for Quark. I can't think of any other in-production 32bit only processor at this point. Big core Intel went 64bit 2006 or so, atoms mostly 2008 or so (with some stragglers that are 32 or 64 bit depending if it's enabled) until 2011 (Cedartrail) If someone stuck a fork in it just after the next long term kernel release then by the time that expired it would probably be historical interest only. Does it not depend if there is someone crazy enough to maintain it however - 68000 is doing fine 8) Alan -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org