From: Michael Ellerman <mpe@ellerman•id.au>
To: Charlie Jenkins <charlie@rivosinc•com>,
Arnd Bergmann <arnd@arndb•de>,
Richard Henderson <richard.henderson@linaro•org>,
Ivan Kokshaysky <ink@jurassic•park.msu.ru>,
Matt Turner <mattst88@gmail•com>,
Vineet Gupta <vgupta@kernel•org>,
Russell King <linux@armlinux•org.uk>, Guo Ren <guoren@kernel•org>,
Huacai Chen <chenhuacai@kernel•org>,
WANG Xuerui <kernel@xen0n•name>,
Thomas Bogendoerfer <tsbogend@alpha•franken.de>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership•com>,
Helge Deller <deller@gmx•de>, Nicholas Piggin <npiggin@gmail•com>,
Christophe Leroy <christophe.leroy@csgroup•eu>,
Naveen N Rao <naveen@kernel•org>,
Alexander Gordeev <agordeev@linux•ibm.com>,
Gerald Schaefer <gerald.schaefer@linux•ibm.com>,
Heiko Carstens <hca@linux•ibm.com>,
Vasily Gorbik <gor@linux•ibm.com>,
Christian Borntraeger <borntraeger@linux•ibm.com>,
Sven Schnelle <svens@linux•ibm.com>,
Yoshinori Sato <ysato@users•sourceforge.jp>,
Rich Felker <dalias@libc•org>,
John Paul Adrian Glaubitz <glaubitz@physik•fu-berlin.de>,
"David S. Miller" <davem@davemloft•net>,
Andreas Larsson <andreas@gaisler•com>,
Thomas Gleixner <tglx@linutronix•de>,
Ingo Molnar <mingo@redhat•com>, Borislav Petkov <bp@alien8•de>,
Dave Hansen <dave.hansen@linux•intel.com>,
x86@kernel•org, "H. Peter Anvin" <hpa@zytor•com>,
Andy Lutomirski <luto@kernel•org>,
Peter Zijlstra <peterz@infradead•org>,
Muchun Song <muchun.song@linux•dev>,
Andrew Morton <akpm@linux-foundation•org>,
"Liam R. Howlett" <Liam.Howlett@oracle•com>,
Vlastimil Babka <vbabka@suse•cz>,
Lorenzo Stoakes <lorenzo.stoakes@oracle•com>,
Shuah Khan <shuah@kernel•org>,
Christoph Hellwig <hch@infradead•org>,
Michal Hocko <mhocko@suse•com>,
"Kirill A. Shutemov" <kirill@shutemov•name>,
Chris Torek <chris.torek@gmail•com>
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 <charlie@rivosinc•com>
Subject: Re: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to 47 bits
Date: Fri, 06 Sep 2024 16:59:40 +1000 [thread overview]
Message-ID: <87zfol468z.fsf@mail.lhotse> (raw)
In-Reply-To: <20240905-patches-below_hint_mmap-v3-1-3cd5564efbbb@rivosinc.com>
Charlie Jenkins <charlie@rivosinc•com> 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 <charlie@rivosinc•com>
> ---
> 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
next prev parent reply other threads:[~2024-09-06 6:59 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-05 21:15 [PATCH RFC v3 0/2] mm: Introduce ADDR_LIMIT_47BIT personality flag Charlie Jenkins
2024-09-05 21:15 ` [PATCH RFC v3 1/2] mm: Add personality flag to limit address to 47 bits Charlie Jenkins
2024-09-06 6:59 ` Michael Ellerman [this message]
2024-09-09 19:07 ` Charlie Jenkins
2024-09-10 9:20 ` Christophe Leroy
2024-09-10 12:43 ` Geert Uytterhoeven
2024-09-11 13:38 ` Michael Ellerman
2024-09-12 6:20 ` Charlie Jenkins
2024-09-20 5:10 ` Michael Ellerman
2024-09-11 13:37 ` Michael Ellerman
2024-09-06 7:17 ` Arnd Bergmann
2024-09-06 8:02 ` Lorenzo Stoakes
2024-09-06 8:14 ` Lorenzo Stoakes
2024-09-06 9:14 ` Arnd Bergmann
2024-09-06 9:52 ` Lorenzo Stoakes
2024-09-09 23:22 ` Charlie Jenkins
2024-09-10 9:13 ` Arnd Bergmann
2024-09-10 23:29 ` Charlie Jenkins
2024-09-11 13:50 ` Michael Ellerman
2024-09-06 9:14 ` Guo Ren
2024-09-06 9:55 ` Arnd Bergmann
2024-09-06 11:43 ` Catalin Marinas
2024-09-10 19:08 ` Liam R. Howlett
2024-09-11 0:45 ` Charlie Jenkins
2024-09-11 7:25 ` Arnd Bergmann
2024-09-12 6:06 ` Charlie Jenkins
2024-09-11 18:21 ` Catalin Marinas
2024-09-12 6:18 ` Charlie Jenkins
2024-09-12 10:53 ` Catalin Marinas
2024-09-12 21:15 ` Charlie Jenkins
2024-09-13 10:08 ` Catalin Marinas
2024-09-13 10:21 ` Catalin Marinas
2024-09-13 20:15 ` Charlie Jenkins
2024-09-13 7:41 ` Lorenzo Stoakes
2024-09-13 21:04 ` Charlie Jenkins
2024-10-02 14:26 ` Palmer Dabbelt
2024-09-05 21:15 ` [PATCH RFC v3 2/2] selftests/mm: Create ADDR_LIMIT_47BIT test Charlie Jenkins
2024-09-06 6:08 ` [PATCH RFC v3 0/2] mm: Introduce ADDR_LIMIT_47BIT personality flag Guo Ren
2024-09-06 6:19 ` John Paul Adrian Glaubitz
2024-09-08 11:26 ` Jiaxun Yang
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