From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227TsATy+CVtDABPAvz9oNk0RRBniS1mw4JeJnN/kllT1UbMumfT9wCVnARGFFu276sabOvJ ARC-Seal: i=1; a=rsa-sha256; t=1518388461; cv=none; d=google.com; s=arc-20160816; b=WO6ToHk3afCRA0ySF07Nuke4xszILC8S1bdwH+w/ahzIcVFe5juHQq7rlF/nl/92Er GfKHoe5jsRXRaLUBttfInpfAaqMCJ685yQCD0zaQQSm0AkIVm70pWKxPwjAapXIM2k/P aIu9kxY0PHywC80R8vE30w7B6QmHBNG9v6BAZ/uDwhFuKxU/K5C0SAVHG+fyguWf9g+h 2pnQDBDMpPfH2OrYrEHh5OJ+SYayVpikBbPdszHqnJTKoGNw53i+ENYyW/XHGMYGMC7v 0MVImYKAEn51iqJ4wd/szTpcSwNtiNH8NS0YTpYIX7bJUQ0i34U1UxRD2kSypZP489vw Ywfg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=user-agent:in-reply-to:content-transfer-encoding :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:arc-authentication-results; bh=M0HjyEd+eqLXcWSYVgYIFaeG1hxwhQNj3nMgfzKUnXo=; b=l0nXWub0+inpspoU8zyb0BNLm4WzBX1NM3Wrh6mS5hXBjFWovJLmv6vpRr0z253aQP 82nX7R45Dc21g9cWFP0WigKmQq522nlinayWBGCK1vCGb9b4BEalwgJBJdlP2lGYM1on 14XbQt9QIUH2pNqXMwzQrRo+LFG/8yO5Ws+HxRkPCzggu3NBY8QA/0s9QdCUz8Ae40BT xqREU9A+S2tmDYOdDzfdlJQBnQEuvPpchua9CWqhjkYX8RP4UlbS7PLo3X8B2iXGHiFa sRrOcAQriiPrTAPSCRUOMupXQ2mNOeNo3QPbZx7mmLpd/bg35bgkgICAG5F0Nq0pw/Yp dE0A== ARC-Authentication-Results: i=1; mx.google.com; spf=neutral (google.com: 195.113.26.193 is neither permitted nor denied by best guess record for domain of pavel@ucw.cz) smtp.mailfrom=pavel@ucw.cz Authentication-Results: mx.google.com; spf=neutral (google.com: 195.113.26.193 is neither permitted nor denied by best guess record for domain of pavel@ucw.cz) smtp.mailfrom=pavel@ucw.cz Date: Sun, 11 Feb 2018 23:34:18 +0100 From: Pavel Machek 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 Subject: Re: [PATCH 00/31 v2] PTI support for x86_32 Message-ID: <20180211223416.GA3762@localhost> 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-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1591914900490843452?= X-GMAIL-MSGID: =?utf-8?q?1592145699758755881?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Sun 2018-02-11 11:42:47, Andy Lutomirski wrote: >=20 >=20 > On Feb 11, 2018, at 9:40 AM, Mark D Rustad wrote: >=20 > >> On Feb 11, 2018, at 2:59 AM, Adam Borowski wrote: > >>=20 > >>> Does Debian make it easy to upgrade to a 64-bit kernel if you have a > >>> 32-bit install? > >>=20 > >> Quite easy, yeah. Crossgrading userspace is not for the faint of the = heart, > >> but changing just the kernel is fine. > >=20 > > 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 thin= k they were rejected. I haven't messed with that stuff in many years, so pe= rhaps the userspace side now has accommodation for it. It might be somethin= g to check on. > >=20 It might make sense to retry those patches... if we want people to move to 64bit kernels, it makes sense to provide complete emulation for 32bit distros... > At the risk of suggesting heresy, should we consider removing x86_32 > support at some point? Heresy! We still support 486s. I don't know if anyone really uses them, but T40p is an acceptable machine to ssh from. X60 is still the machine I prefer for traveling. Fast enough if you don't compile, and nicer keyboard/screen than X220... Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html