linux-kernel - Re: [PATCH v2 15/18] sparc64: remove CONFIG_SET

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Date:   Wed, 16 Feb 2022 19:34:59 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     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,
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Subject: Re: [PATCH v2 15/18] sparc64: remove CONFIG_SET_FS support

Hi Arnd.

On Wed, Feb 16, 2022 at 02:13:29PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> sparc64 uses address space identifiers to differentiate between kernel
> and user space, using ASI_P for kernel threads but ASI_AIUS for normal
> user space, with the option of changing between them.
> 
> As nothing really changes the ASI any more, just hardcode ASI_AIUS
> everywhere. Kernel threads are not allowed to access __user pointers
> anyway.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/sparc/include/asm/processor_64.h   |  4 ----
>  arch/sparc/include/asm/switch_to_64.h   |  4 +---
>  arch/sparc/include/asm/thread_info_64.h |  4 +---
>  arch/sparc/include/asm/uaccess_64.h     | 20 +-------------------
>  arch/sparc/kernel/process_64.c          | 12 ------------
>  arch/sparc/kernel/traps_64.c            |  2 --
>  arch/sparc/lib/NGmemcpy.S               |  3 +--
>  arch/sparc/mm/init_64.c                 |  7 ++++---
>  8 files changed, 8 insertions(+), 48 deletions(-)

I think you somehow missed the Kconfig change, and also the related
sparc32 change which continue to have set_fs() after this patch.


I did not manage to review the patch - as I am too unfamiliar with the
code paths and the set_fs() removal changes.

	Sam