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From:   Max Filippov <jcmvbkbc@gmail.com>
Date:   Thu, 21 Nov 2019 17:26:47 -0800
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Subject: Re: [PATCH 3/3] arm64: remove the rest of asm-uaccess.h
To:     Pavel Tatashin <pasha.tatashin@soleen.com>
Cc:     jmorris@namei.org, Sasha Levin <sashal@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, steve.capper@arm.com,
        linux-arm-kernel@lists.infradead.org, marc.zyngier@arm.com,
        James Morse <james.morse@arm.com>, vladimir.murzin@arm.com,
        Mark Rutland <mark.rutland@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
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        Masahiro Yamada <yamada.masahiro@socionext.com>,
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        Russell King <linux@armlinux.org.uk>
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On Thu, Nov 21, 2019 at 10:50 AM Pavel Tatashin
<pasha.tatashin@soleen.com> wrote:
>
> The __uaccess_ttbr0_disable and __uaccess_ttbr0_enable,
> are the last two macros defined in asm-uaccess.h.
>
> Replace them with C wrappers and call C functions from
> kernel_entry and kernel_exit.
>
> Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
> ---
>  arch/arm64/include/asm/asm-uaccess.h | 38 ----------------------------
>  arch/arm64/kernel/entry.S            |  6 ++---
>  arch/arm64/lib/clear_user.S          |  2 +-
>  arch/arm64/lib/copy_from_user.S      |  2 +-
>  arch/arm64/lib/copy_in_user.S        |  2 +-
>  arch/arm64/lib/copy_to_user.S        |  2 +-
>  arch/arm64/mm/cache.S                |  1 -
>  arch/arm64/mm/context.c              | 12 +++++++++
>  arch/xtensa/kernel/coprocessor.S     |  1 -
>  9 files changed, 19 insertions(+), 47 deletions(-)
>  delete mode 100644 arch/arm64/include/asm/asm-uaccess.h

[...]

> diff --git a/arch/xtensa/kernel/coprocessor.S b/arch/xtensa/kernel/coprocessor.S
> index 80828b95a51f..6329d17e2aa0 100644
> --- a/arch/xtensa/kernel/coprocessor.S
> +++ b/arch/xtensa/kernel/coprocessor.S
> @@ -18,7 +18,6 @@
>  #include <asm/processor.h>
>  #include <asm/coprocessor.h>
>  #include <asm/thread_info.h>
> -#include <asm/asm-uaccess.h>
>  #include <asm/unistd.h>
>  #include <asm/ptrace.h>
>  #include <asm/current.h>

This is not related to arm64 or to the changes in the description,
but the change itself is OK. Whether you keep it in this patch,
or choose to split it out feel free to add

Acked-by: Max Filippov <jcmvbkbc@gmail.com> # for xtensa bits

-- 
Thanks.
-- Max