Re: [PATCH v2 09/18] mips: use simpler access_ok()
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- To: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
- Subject: Re: [PATCH v2 09/18] mips: use simpler access_ok()
- From: Arnd Bergmann <arnd@xxxxxxxxxx>
- Date: Wed, 23 Feb 2022 10:26:49 +0100
- Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, linux-arch <linux-arch@xxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Guo Ren <guoren@xxxxxxxxxx>, Brian Cain <bcain@xxxxxxxxxxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Michal Simek <monstr@xxxxxxxxx>, Nick Hu <nickhu@xxxxxxxxxxxxx>, Greentime Hu <green.hu@xxxxxxxxx>, Dinh Nguyen <dinguyen@xxxxxxxxxx>, Stafford Horne <shorne@xxxxxxxxx>, Helge Deller <deller@xxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Heiko Carstens <hca@xxxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, David Miller <davem@xxxxxxxxxxxxx>, Richard Weinberger <richard@xxxxxx>, "the arch/x86 maintainers" <x86@xxxxxxxxxx>, Max Filippov <jcmvbkbc@xxxxxxxxx>, "Eric W . Biederman" <ebiederm@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, alpha <linux-alpha@xxxxxxxxxxxxxxx>, "open list:SYNOPSYS ARC ARCHITECTURE" <linux-snps-arc@xxxxxxxxxxxxxxxxxxx>, linux-csky@xxxxxxxxxxxxxxx, "open list:QUALCOMM HEXAGON..." <linux-hexagon@xxxxxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, linux-m68k <linux-m68k@xxxxxxxxxxxxxxx>, "open list:BROADCOM NVRAM DRIVER" <linux-mips@xxxxxxxxxxxxxxx>, Openrisc <openrisc@xxxxxxxxxxxxxxxxxxxx>, Parisc List <linux-parisc@xxxxxxxxxxxxxxx>, linuxppc-dev <linuxppc-dev@xxxxxxxxxxxxxxxx>, linux-riscv <linux-riscv@xxxxxxxxxxxxxxxxxxx>, linux-s390 <linux-s390@xxxxxxxxxxxxxxx>, Linux-sh list <linux-sh@xxxxxxxxxxxxxxx>, sparclinux <sparclinux@xxxxxxxxxxxxxxx>, linux-um <linux-um@xxxxxxxxxxxxxxxxxxx>, "open list:TENSILICA XTENSA PORT (xtensa)" <linux-xtensa@xxxxxxxxxxxxxxxx>
- In-reply-to: <20220223074127.GA8287@alpha.franken.de>
- References: <20220216131332.1489939-1-arnd@kernel.org> <20220216131332.1489939-10-arnd@kernel.org> <20220223074127.GA8287@alpha.franken.de>
On Wed, Feb 23, 2022 at 8:41 AM Thomas Bogendoerfer
<tsbogend@xxxxxxxxxxxxxxxx> wrote:
>
> On Wed, Feb 16, 2022 at 02:13:23PM +0100, Arnd Bergmann wrote:
> > diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
> > index db9a8e002b62..d7c89dc3426c 100644
> > --- a/arch/mips/include/asm/uaccess.h
> > +++ b/arch/mips/include/asm/uaccess.h
> > @@ -19,6 +19,7 @@
> > #ifdef CONFIG_32BIT
> >
> > #define __UA_LIMIT 0x80000000UL
> > +#define TASK_SIZE_MAX __UA_LIMIT
>
> using KSEG0 instead would IMHO be the better choice. This gives the
> chance to remove __UA_LIMIT completly after cleaning up ptrace.c
Ok, changed now.
Arnd
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