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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 , 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 Message-ID: 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87zfol468z.fsf@mail.lhotse> X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: C8D26100014 X-Stat-Signature: pxjwo6y6pz7jkwwftuajnf8mdct35koz X-HE-Tag: 1725908853-145337 X-HE-Meta: U2FsdGVkX1+cstC0x7MCFd38kSwVy/zizHl49RI0s2ehTT0W+ghWLzvPFxU86BJAOrGzW9ue6spgSlW/TCRIEu9VzkcynpqufPmOKANtmVfCVQsllR+BGBrgAkQQ78EVsB7nUKmCK6Nech5/JboFUc5fakV8xoc2NB0BoXSTqXmaz5E3PN7QFYzfgw8C2kZP8Hkvz5Lhq/ep9qcYNaWbMdAkj5EaGln0G+QN793+6+lexqimFLc/Xsic5CnFNgIJQuIpofRIpuozv0ZCKIi4d+WYhCaf0FxW/rXJHYTLHuEj+xgLvAaNzo5+pyykDep+HbbuvCSHHD2WShZmeR2O772ezFfv1voy57zx13aO4VzS/nydjh2dYMSuMcN8zbE4QSIwzZtsuDS5lnwKKklkSQPr3Tmi2cqW/5qUFgQIOb/Qp6MM8BezE80lDnb0oHPmpJy1gfBLYIJD8gRPAVpqWXJw4WVXg13XbRHOzYyYydEuwhHGwqnyhyGSPosm5wNGHzbQ8tQnMRqsK9pxPQWSNmx3XZsHbiu5C1pFghpjIoKq3htJiExcmXx8dcEz6F/2er6328R6JBKZQkQfY9a6hbRX1ny+NsDpnXae7IZ4sZRACkBr2OnfK3PjQgIa6jHK8yx5Trs0NZhR6UmNjO4PQHd7UMrKzW3s8RutdbienqUAC0Yw+yo/ubmw29vgy+oL3F0ZNVG1leWQKu+GpXhgyUF4Be6vKMW4J18KX6QkNw9FhocCXgy4Q10o1qAd1OfjeW7qpABXds6MC759O9YyUW6Ps6G7n6hyvvxgxUvYYa33wsn01Zu0s5r/bWOSc9tsXPmFYaS4O0Yb/vWM3l3Njr6F83AZhsw8f9+OhUfIu8QegO45UPmJoRRZZtDxbFvD7+Sinvn7qQck8UIEycTZ1/N7/4/+EsfLjQdl4wXg2dc8ohbwThRjL1tgoz7XshyZND6TiUlmaXM/ie3kjQa PaLTaI7W AQ4UYaOot8LMGvmZVf1B2ZkRO7iCtTe4Js2AOJiQYTeTn+wFbPKVz6s11k3rERSzfmZ02+Kp/iO9DIQW0pLpFDMu3I+7+poShRxJ9H3vwF6DuClVH8R/Hpt/91AQOujcANiSn+IEPHn/rg5VocWQSaqfZxqolHSIph2rGpRlMj+M2FGBQWEAyQlg3hD+62JQ0PNaJjGUT4Z5t4j8pJkuU4idvr+Z6tQEu5aoTegrYJCqXRJiY+jVEqAxGooFkh28khVHL0nFMO9s5UG1h0a2wpVQXsIuiODwUpOCltkdH4jLhUUdmgzGdfKrDGPkDeVZsvNbpauR4x/gQQqFekJtF7kZuh96Bns9Ta9ha/VmJ+qUGb/aT03fcCHuyHS2SVvXS1OBiuEHONoYUo5kuGDCyZbIuXICgzT4xEXDCAUDXlcZ0R4mFNgeDVjHwkwVQixmP5C8kfTZsHyd8TXmxG4C1EPIfpA== 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: On Fri, Sep 06, 2024 at 04:59:40PM +1000, Michael Ellerman wrote: > 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? > I don't follow, what does 128T represent? > Have you looked at writing an update for the personality(2) man page? :) I will write an update to the man page if this patch is approved! > > cheers - Charlie