From: Arnd Bergmann <arnd@arndb.de>
To: Guo Ren <guoren@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>,
Arnd Bergmann <arnd@arndb.de>, Anup Patel <anup@brainfault.org>,
gregkh <gregkh@linuxfoundation.org>,
liush <liush@allwinnertech.com>, Wei Fu <wefu@redhat.com>,
Drew Fustini <drew@beagleboard.org>,
Wang Junqiang <wangjunqiang@iscas.ac.cn>,
Christoph Hellwig <hch@lst.de>,
Christoph Hellwig <hch@infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-csky@vger.kernel.org,
linux-s390 <linux-s390@vger.kernel.org>,
sparclinux <sparclinux@vger.kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
inux-parisc@vger.kernel.org,
"open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
"the arch/x86 maintainers" <x86@kernel.org>,
Guo Ren <guoren@linux.alibaba.com>
Subject: Re: [PATCH V3 07/17] riscv: compat: Re-implement TASK_SIZE for COMPAT_32BIT
Date: Thu, 20 Jan 2022 10:31:09 +0100 [thread overview]
Message-ID: <CAK8P3a1UvqsS-D7cVXBkp4KCRWDfquQ6QTkvrQ=FqLxhsAi7Rw@mail.gmail.com> (raw)
In-Reply-To: <20220120073911.99857-8-guoren@kernel.org>
On Thu, Jan 20, 2022 at 8:39 AM <guoren@kernel.org> wrote:
>
> From: Guo Ren <guoren@linux.alibaba.com>
>
> Make TASK_SIZE from const to dynamic detect TIF_32BIT flag
> function. Refer to arm64 to implement DEFAULT_MAP_WINDOW_64 for
> efi-stub.
>
> Limit 32-bit compatible process in 0-2GB virtual address range
> (which is enough for real scenarios), because it could avoid
> address sign extend problem when 32-bit enter 64-bit and ease
> software design.
>
> The standard 32-bit TASK_SIZE is 0x9dc00000:FIXADDR_START, and
> compared to a compatible 32-bit, it increases 476MB for the
> application's virtual address.
>
> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> Signed-off-by: Guo Ren <guoren@kernel.org>
> Cc: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
next prev parent reply other threads:[~2022-01-20 9:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-20 7:39 [PATCH V3 07/17] riscv: compat: Re-implement TASK_SIZE for COMPAT_32BIT guoren
2022-01-20 9:31 ` Arnd Bergmann [this message]
2022-01-20 12:53 ` David Laight
2022-01-20 13:27 ` Guo Ren
2022-01-20 14:57 ` Arnd Bergmann
2022-01-20 15:46 ` David Laight
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