linux-kernel - Re: [PATCH 5/6] uaccess: add force_uaccess

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Date:   Mon, 13 Jul 2020 13:26:37 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Christoph Hellwig <hch@....de>
Cc:     Nick Hu <nickhu@...estech.com>, Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-riscv@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] uaccess: add force_uaccess_{begin,end} helpers

On Fri, Jul 10, 2020 at 03:57:05PM +0200, Christoph Hellwig wrote:
> Add helpers to wraper the get_fs/set_fs magic for undoing any damange
> done by set_fs(KERNEL_DS).  There is no real functional benefit, but this
> documents the intent of these calls better, and will allow stubbing the
> functions out easily for kernels builds that do not allow address space
> overrides in the future.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/arm64/kernel/sdei.c         |  2 +-
>  arch/m68k/include/asm/tlbflush.h | 12 ++++++------
>  arch/mips/kernel/unaligned.c     | 27 +++++++++++++--------------
>  arch/nds32/mm/alignment.c        |  7 +++----
>  arch/sh/kernel/traps_32.c        | 18 ++++++++----------
>  drivers/firmware/arm_sdei.c      |  5 ++---
>  include/linux/uaccess.h          | 18 ++++++++++++++++++
>  kernel/events/callchain.c        |  5 ++---
>  kernel/events/core.c             |  5 ++---
>  kernel/kthread.c                 |  5 ++---
>  kernel/stacktrace.c              |  5 ++---
>  mm/maccess.c                     | 22 ++++++++++------------
>  12 files changed, 69 insertions(+), 62 deletions(-)

The perf core and arm64/sdei bits look sound. FWIW:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.