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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C330BEE49A5 for ; Wed, 11 Sep 2024 13:39:01 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 35C4D94003C; Wed, 11 Sep 2024 09:39:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 30C69940021; Wed, 11 Sep 2024 09:39:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1AD7D94003C; Wed, 11 Sep 2024 09:39:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id F05CD940021 for ; Wed, 11 Sep 2024 09:39:00 -0400 (EDT) Received: from smtpin08.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id AA1EE1618CD for ; Wed, 11 Sep 2024 13:39:00 +0000 (UTC) X-FDA: 82552563240.08.88695A6 Received: from mail.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) by imf29.hostedemail.com (Postfix) with ESMTP id 7994C12000E for ; Wed, 11 Sep 2024 13:38:58 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=ellerman.id.au header.s=201909 header.b=oIPjnjA3; spf=pass (imf29.hostedemail.com: domain of mpe@ellerman.id.au designates 150.107.74.76 as permitted sender) smtp.mailfrom=mpe@ellerman.id.au; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1726061886; a=rsa-sha256; cv=none; b=m0I5/uVa5z9xmEk9os7wi7glqcGxsAOmb2PfrQcbaUCAew9f7FPqO+lSrU2YGmX/mr2c8V nyNynz8nCNawK3cwua5/CuCFix2f1RO8R+nAbsePdwSyZyQ+48qKQIOejv93vV9lEmUFoJ ZlLraEiU177Av8CSCmpfIjOEHkCHuKc= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=pass header.d=ellerman.id.au header.s=201909 header.b=oIPjnjA3; spf=pass (imf29.hostedemail.com: domain of mpe@ellerman.id.au designates 150.107.74.76 as permitted sender) smtp.mailfrom=mpe@ellerman.id.au; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1726061886; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=/x6ppqNQQLzdvBUIltgwblDbEd/NsLYvkwyhRq8ySOg=; b=Ei9iWX28QfLOjBIhbAmsHTWSzbrDcz9M+GjByO1fzlQsVKNgpEie4wLlr7qJ4hiK8U8IBZ 48fOj8y7R71I98ixhK2PsRuNxthg277gw3SJ19xTHFTf//wzCOVdhqIl0YP4BqofYIl0gd gDsPwefcz3PXBm0Ph1T/jbpRtxGM0t0= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ellerman.id.au; s=201909; t=1726061936; bh=/x6ppqNQQLzdvBUIltgwblDbEd/NsLYvkwyhRq8ySOg=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=oIPjnjA38dDfnNUU0Rs/abozRGK9t9kzNcCWqs5zkrEw2u4QwGt3vFSpn0kotBm8X fivnKpkEy/q9VIrQ4TVvIWeyCWERZBfrVvamUQzRqxJXXE/ps5sAChCuugQudut2zk DVgLI54TE1CBwlW9mpADteXyPpiwyWh5AMK6K8+zAbXoPZkgJcSleQSG3qGcaJyJXX A5ciDIpzEWsP5XUlIHYqj38DukHhKGL3HyneCvdybHcxtCNddxIqe5i6i2FP5wwBY7 57TlSw4u4a4SBXs0AeeOR/Okf9JAYihkTJfD71w2XroNa0syJ2Nx+YmIr7sD2bhmLV DphJhs7LqH5rg== Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mail.ozlabs.org (Postfix) with ESMTPSA id 4X3hVm0rPLz4x8Q; Wed, 11 Sep 2024 23:38:55 +1000 (AEST) From: Michael Ellerman To: Geert Uytterhoeven , Christophe Leroy Cc: Charlie Jenkins , Arnd Bergmann , Richard Henderson , Ivan Kokshaysky , Matt Turner , Vineet Gupta , Russell King , Guo Ren , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Nicholas Piggin , Naveen N Rao , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Andreas Larsson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Muchun Song , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Shuah Khan , Christoph Hellwig , Michal Hocko , "Kirill A. Shutemov" , Chris Torek , linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-abi-devel@lists.sourceforge.net Subject: Re: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to 47 bits In-Reply-To: References: <20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@rivosinc.com> <20240905-patches-below_hint_mmap-v3-1-3cd5564efbbb@rivosinc.com> <87zfol468z.fsf@mail.lhotse> <1aca8e4c-1c12-4624-a689-147ff60b75d6@csgroup.eu> Date: Wed, 11 Sep 2024 23:38:55 +1000 Message-ID: <8734m6s428.fsf@mail.lhotse> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Stat-Signature: sns6yggthb15zw9x3wdgtcso1upw5mz4 X-Rspamd-Queue-Id: 7994C12000E X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1726061938-712577 X-HE-Meta: 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 bLJ2sqlL s8885kZUvSUsCAUhZ5HYeNdc82nUF+eREnooj8Jofu9NnjwqjM0rvG/TEz+QICg/SPUsMttJ3QGLXRSBIPFkSgid+y1iNuKV7dJeIDADFlDbTSqfUq1g20MZ95W7+kmIrHED0qDd6MaSIR6WCH7EiDVF1Aa8YkfpNoVG7L98zIqCP8TZpxeqlPHLJ7nRIIyVLYFP7MyAmnORnGiZe2LqLF0YpRhSHCLFm9VcD+64xRb6LJuVljvBDkOtl1d4PnD1XvWuN1viRRPFqi+EqnoFSDY14zsgBkmmoyvonTd+ZOUAO6WJS6C5CrDfUpjVjTNybMLpEg0xGEcHTIKSVZY5jndjTJl2wD8A8Hg7BuKy6DNUwPvPp9/DrvhdrO7CbA5PGL6BLdfybkdHAIiYFzE3cEyWFwN3d5XBoMJS8 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Geert Uytterhoeven writes: > Hi Christophe, > > On Tue, Sep 10, 2024 at 11:21=E2=80=AFAM Christophe Leroy > wrote: >> >>> diff --git a/include/uapi/linux/personality.h b/include/uapi/linux/p= ersonality.h >> >>> index 49796b7756af..cd3b8c154d9b 100644 >> >>> --- a/include/uapi/linux/personality.h >> >>> +++ b/include/uapi/linux/personality.h >> >>> @@ -22,6 +22,7 @@ enum { >> >>> WHOLE_SECONDS =3D 0x2000000, >> >>> STICKY_TIMEOUTS =3D 0x4000000, >> >>> ADDR_LIMIT_3GB =3D 0x8000000, >> >>> + ADDR_LIMIT_47BIT =3D 0x10000000, >> >>> }; >> >> >> >> I wonder if ADDR_LIMIT_128T would be clearer? >> >> >> > >> > I don't follow, what does 128T represent? >> >> 128T is 128 Terabytes, that's the maximum size achievable with a 47BIT >> address, that naming would be more consistant with the ADDR_LIMIT_3GB >> just above that means a 3 Gigabytes limit. > > Hence ADDR_LIMIT_128TB? Yes it should be 128TB. Typo by me. cheers