linux-kernel - Re: [PATCH v2 18/18] uaccess: drop maining CONFIG_SET

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Date:   Thu, 24 Feb 2022 22:33:46 -0600
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org, arnd@...db.de,
        linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk
Cc:     linux@...linux.org.uk, will@...nel.org, guoren@...nel.org,
        bcain@...eaurora.org, geert@...ux-m68k.org, monstr@...str.eu,
        tsbogend@...ha.franken.de, nickhu@...estech.com,
        green.hu@...il.com, shorne@...il.com, deller@....de,
        mpe@...erman.id.au, peterz@...radead.org, mingo@...hat.com,
        mark.rutland@....com, hca@...ux.ibm.com, dalias@...c.org,
        davem@...emloft.net, richard@....at, x86@...nel.org,
        jcmvbkbc@...il.com, ebiederm@...ssion.com,
        akpm@...ux-foundation.org, ardb@...nel.org,
        linux-alpha@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, openrisc@...ts.librecores.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-um@...ts.infradead.org, linux-xtensa@...ux-xtensa.org
Subject: Re: [PATCH v2 18/18] uaccess: drop maining CONFIG_SET_FS users



On 2/16/22 07:13, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> There are no remaining callers of set_fs(), so CONFIG_SET_FS
> can be removed globally, along with the thread_info field and
> any references to it.
> 
> This turns access_ok() into a cheaper check against TASK_SIZE_MAX.
> 
> With CONFIG_SET_FS gone, so drop all remaining references to
> set_fs()/get_fs(), mm_segment_t and uaccess_kernel().
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   arch/Kconfig                              |  3 -
>   arch/alpha/Kconfig                        |  1 -
>   arch/alpha/include/asm/processor.h        |  4 --
>   arch/alpha/include/asm/thread_info.h      |  2 -
>   arch/alpha/include/asm/uaccess.h          | 19 ------
>   arch/arc/Kconfig                          |  1 -
>   arch/arc/include/asm/segment.h            | 20 -------
>   arch/arc/include/asm/thread_info.h        |  3 -
>   arch/arc/include/asm/uaccess.h            |  1 -
>   arch/arm/lib/uaccess_with_memcpy.c        | 10 ----
>   arch/csky/Kconfig                         |  1 -
>   arch/csky/include/asm/processor.h         |  2 -
>   arch/csky/include/asm/segment.h           | 10 ----
>   arch/csky/include/asm/thread_info.h       |  2 -
>   arch/csky/include/asm/uaccess.h           |  3 -
>   arch/csky/kernel/asm-offsets.c            |  1 -
>   arch/h8300/Kconfig                        |  1 -
>   arch/h8300/include/asm/processor.h        |  1 -
>   arch/h8300/include/asm/segment.h          | 40 -------------
>   arch/h8300/include/asm/thread_info.h      |  3 -
>   arch/h8300/kernel/entry.S                 |  1 -
>   arch/h8300/kernel/head_ram.S              |  1 -
>   arch/h8300/mm/init.c                      |  6 --
>   arch/h8300/mm/memory.c                    |  1 -
>   arch/hexagon/Kconfig                      |  1 -
>   arch/hexagon/include/asm/thread_info.h    |  6 --
>   arch/hexagon/kernel/process.c             |  1 -
>   arch/microblaze/Kconfig                   |  1 -
>   arch/microblaze/include/asm/thread_info.h |  6 --
>   arch/microblaze/include/asm/uaccess.h     | 24 --------
>   arch/microblaze/kernel/asm-offsets.c      |  1 -
>   arch/microblaze/kernel/process.c          |  1 -
>   arch/nds32/Kconfig                        |  1 -
>   arch/nds32/include/asm/thread_info.h      |  4 --
>   arch/nds32/include/asm/uaccess.h          | 15 +----
>   arch/nds32/kernel/process.c               |  5 +-
>   arch/nds32/mm/alignment.c                 |  3 -
>   arch/nios2/Kconfig                        |  1 -
>   arch/nios2/include/asm/thread_info.h      |  9 ---
>   arch/nios2/include/asm/uaccess.h          | 12 ----

For NIOS2:

Acked-by: Dinh Nguyen <dinguyen@...nel.org>