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Bottomley" , Helge Deller , Nicholas Piggin , Christophe Leroy , 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 Cc: 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, Charlie Jenkins Subject: Re: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to 47 bits In-Reply-To: <20240905-patches-below_hint_mmap-v3-1-3cd5564efbbb@rivosinc.com> References: <20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@rivosinc.com> <20240905-patches-below_hint_mmap-v3-1-3cd5564efbbb@rivosinc.com> Date: Fri, 06 Sep 2024 16:59:40 +1000 Message-ID: <87zfol468z.fsf@mail.lhotse> MIME-Version: 1.0 Content-Type: text/plain X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 53CBB140020 X-Stat-Signature: 36rh1w4ritg4jdsegim79fqx1kjnx7u1 X-HE-Tag: 1725605987-20008 X-HE-Meta: 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 CQWWwRnn bunerUqpQ18FE2nlmsezEzun4XRKAPwmOrALvXMLylfLBzTwMyuCuavU1Kn/5Fh4kQ/pKcz1lNeKzrLPAVnGlMa97VGFhAlnwiKCQyDyF/dsHWwXJpRYDqZ6wo0nCFlwj5yes8+Zoby62n+3WoxuBozXCD3KVGqbjjieVvs+VeLeOS6qLfgqTsV2VQc0/HwM7Rup62u3gGueJwW8JfKAao7qUSPMzLf5U6MzVQrJweOcOgQrN/HHsXZzQaGoD51VvPZjW4uwF+H2BPKZZua1laIkGsaRYyAWgxzqY9Demk305Zs617SavHhNUKg== 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: Charlie Jenkins writes: > Create a personality flag ADDR_LIMIT_47BIT to support applications > that wish to transition from running in environments that support at > most 47-bit VAs to environments that support larger VAs. This > personality can be set to cause all allocations to be below the 47-bit > boundary. Using MAP_FIXED with mmap() will bypass this restriction. > > Signed-off-by: Charlie Jenkins > --- > include/uapi/linux/personality.h | 1 + > mm/mmap.c | 3 +++ > 2 files changed, 4 insertions(+) > > diff --git a/include/uapi/linux/personality.h b/include/uapi/linux/personality.h > index 49796b7756af..cd3b8c154d9b 100644 > --- a/include/uapi/linux/personality.h > +++ b/include/uapi/linux/personality.h > @@ -22,6 +22,7 @@ enum { > WHOLE_SECONDS = 0x2000000, > STICKY_TIMEOUTS = 0x4000000, > ADDR_LIMIT_3GB = 0x8000000, > + ADDR_LIMIT_47BIT = 0x10000000, > }; I wonder if ADDR_LIMIT_128T would be clearer? Have you looked at writing an update for the personality(2) man page? :) cheers