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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0AF15EE49A6 for ; Wed, 11 Sep 2024 13:38:57 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4X3hVm1jJyz2xjh; Wed, 11 Sep 2024 23:38:56 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=150.107.74.76 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1726061936; cv=none; b=jvYnefslMy8DRwzBhsPAyJqH+Z0ErW9r0P3TEMOvbu3f15wJ3sc0z7xN+TBu/6HFYaNcgdDT6uIuEbBWUrFUgl47AbhoKtXsGPU9HcHHACjgDrPN3kldPYiD7OpeQW+h0fAhfOHMAS/i7bAhgRJ39kZV2gEnm8Zn5hUhvNtXL6EJEZ35sUmbh3GpRG7/WeVU0+AU0/Q4NTqvcv4XA8C5lT3aeVfvN9jeyhwOeneNDr55zcxKrTC70+aqsXkOJDxS6SCGjfldSk8dd9eHnRcRRHxy0y0gsxPDiQWamvD8cqNiHWWzkBTMBtJTCVVEBb6lwzH7n6BOozmes7Ghsxw1VA== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1726061936; c=relaxed/relaxed; bh=/x6ppqNQQLzdvBUIltgwblDbEd/NsLYvkwyhRq8ySOg=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=kUA2fFHGdF6hclOnj9akt5TCgyZ9AL3T2W1/fAcVzizqDbGhzgrWR9AxCiVt+3q50VhbdrJ8giHJmlF8MOPGkBXX5wCsBL110jisUHOH5rgPghodsenIJ7X/3cT/oxJ8E1ww1J0bVfsO8ohTd6DlXwm93yjsQl7GV2p7C2FfHOUNvTxj3H2GVHLjAsGWtv6bLQiwsyrk6730TPuvdWCfp5bnMVRQvrGefbXijO+hBW86KC+Q07r2O3xVwTnFFL23a82FS9irnPmDdVUTMcHhgLMJZVgGEaTHIxtTSMUP6Y8zMlOKLVaDPGDfqsQe3H6HzxDVhBUJRw0vfSi2EegCvA== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=oIPjnjA3; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=oIPjnjA3; dkim-atps=neutral Received: from mail.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4X3hVm1Ysgz2xcs for ; Wed, 11 Sep 2024 23:38:56 +1000 (AEST) 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> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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