linux-kernel - Re: [PATCH -next v2 0/2]riscv: some refactorings realted to uaccess and extable

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Message-ID: <868e2e01-3462-dcb3-257a-f71d904b2a27@huawei.com>
Date:   Thu, 25 Aug 2022 11:04:59 +0800
From:   Tong Tiangen <tongtiangen@...wei.com>
To:     <Conor.Dooley@...rochip.com>, <paul.walmsley@...ive.com>,
        <palmer@...belt.com>, <palmer@...osinc.com>,
        <aou@...s.berkeley.edu>
CC:     <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <wangkefeng.wang@...wei.com>, <guohanjun@...wei.com>
Subject: Re: [PATCH -next v2 0/2]riscv: some refactorings realted to uaccess
 and extable



在 2022/8/25 0:49, Conor.Dooley@...rochip.com 写道:
> On 24/08/2022 07:31, Tong Tiangen wrote:
>> Hi riscv maintainers, kindly ping...
>>
>> Thanks,
>> Tong.
>>
>> 在 2022/8/15 11:20, Tong Tiangen 写道:
> 
> It's barely been more than a week, relax :)
> 
> checkpatch really does not like one of the macros you added. Please
> consider whether this is valid:
> 
> ERROR: Macros with complex values should be enclosed in parentheses
> #38: FILE: arch/riscv/include/asm/asm-extable.h:61:
> +#define _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, zero)          \
> +       __DEFINE_ASM_GPR_NUMS                                           \
> +       __ASM_EXTABLE_RAW(#insn, #fixup,                                \
> +                         __stringify(EX_TYPE_KACCESS_ERR_ZERO),        \
> +                         "("                                           \
> +                           EX_DATA_REG(ERR, err) " | "                 \
> +                           EX_DATA_REG(ZERO, zero)                     \
> +                         ")")
> 
> Thanks,
> Conor.


Judging from the use context of this macro, there is no problem with the 
definition of this macro.

In addition, I refer to the definition of macro 
_ASM_EXTABLE_UACCESS_ERR_ZERO for the style of this macro. The 
difference is that the types used in the macro are different.

:)

Thanks,
Tong.

> 
>>> This patchset do some refactorings related to riscv's uaccess and extable,
>>> mainly for the usage of __get/put_user_nocheck() which not distinguish user
>>> access and kernel access.
>>>
>>> v1 -> v2:
>>>     According to Conor's suggestion, split into two logically independent
>>>     patches.
>>>
>>> Tong Tiangen (2):
>>>     riscv: uaccess: rename __get/put_user_nocheck to __get/put_mem_nocheck
>>>     riscv: extable: add new extable type EX_TYPE_KACCESS_ERR_ZERO support
>>>
>>>    arch/riscv/include/asm/asm-extable.h |  12 ++
>>>    arch/riscv/include/asm/uaccess.h     | 162 +++++++++++++--------------
>>>    arch/riscv/mm/extable.c              |   1 +
>>>    3 files changed, 94 insertions(+), 81 deletions(-)
>>>