From: Tong Tiangen <tongtiangen@huawei.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
Mark Rutland <mark.rutland@arm.com>,
James Morse <james.morse@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Robin Murphy <robin.murphy@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
"Catalin Marinas" <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>, <x86@kernel.org>,
"H . Peter Anvin" <hpa@zytor.com>
Cc: <linuxppc-dev@lists.ozlabs.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
Xie XiuQi <xiexiuqi@huawei.com>, Guohanjun <guohanjun@huawei.com>
Subject: Re: [PATCH -next v4 1/7] x86, powerpc: fix function define in copy_mc_to_user
Date: Sun, 24 Apr 2022 09:16:05 +0800 [thread overview]
Message-ID: <4ee686bc-38d4-7709-30a9-0c807919672a@huawei.com> (raw)
In-Reply-To: <87r15p8n9g.fsf@mpe.ellerman.id.au>
在 2022/4/22 17:45, Michael Ellerman 写道:
> Tong Tiangen <tongtiangen@huawei.com> writes:
>> x86/powerpc has it's implementation of copy_mc_to_user but not use #define
>> to declare.
>>
>> This may cause problems, for example, if other architectures open
>> CONFIG_ARCH_HAS_COPY_MC, but want to use copy_mc_to_user() outside the
>> architecture, the code add to include/linux/uaddess.h is as follows:
>>
>> #ifndef copy_mc_to_user
>> static inline unsigned long __must_check
>> copy_mc_to_user(void *dst, const void *src, size_t cnt)
>> {
>> ...
>> }
>> #endif
>
> The above doesn't exist yet, you add it in patch 3, which is a little
> confusing for a reader of this commit in isolation.
>
> I think you could safely move that into this patch, and then this patch
> would be ~= "Add generic fallback version of copy_mc_to_user()".
>
> It's probably not worth doing a whole new version of the series just for
> that, but if you need to do a new version for some other reason I think
> it would be cleaner to introduce the fallback in this commit.
>
Agreed, will do in next version.
Thanks,
Tong.
>> Then this definition will conflict with the implementation of x86/powerpc
>> and cause compilation errors as follow:
>>
>> Fixes: ec6347bb4339 ("x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()")
>> Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
>> ---
>> arch/powerpc/include/asm/uaccess.h | 1 +
>
> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
>
> cheers
> .
next prev parent reply other threads:[~2022-04-24 1:18 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-20 3:04 [PATCH -next v4 0/7]arm64: add machine check safe support Tong Tiangen
2022-04-20 3:04 ` [PATCH -next v4 1/7] x86, powerpc: fix function define in copy_mc_to_user Tong Tiangen
2022-04-22 9:45 ` Michael Ellerman
2022-04-24 1:16 ` Tong Tiangen [this message]
2022-05-02 14:24 ` Christophe Leroy
2022-05-03 1:06 ` Tong Tiangen
2022-05-05 1:21 ` Kefeng Wang
2022-04-20 3:04 ` [PATCH -next v4 2/7] arm64: fix types in copy_highpage() Tong Tiangen
2022-04-20 3:04 ` [PATCH -next v4 3/7] arm64: add support for machine check error safe Tong Tiangen
2022-05-13 15:26 ` Mark Rutland
2022-05-19 6:29 ` Tong Tiangen
2022-05-25 8:30 ` Mark Rutland
2022-05-26 3:36 ` Tong Tiangen
2022-05-26 9:50 ` Mark Rutland
2022-05-27 1:40 ` Tong Tiangen
2022-04-20 3:04 ` [PATCH -next v4 4/7] arm64: add copy_{to, from}_user to machine check safe Tong Tiangen
2022-05-04 10:26 ` Catalin Marinas
2022-05-05 6:39 ` Tong Tiangen
2022-05-05 13:41 ` Catalin Marinas
2022-05-05 14:33 ` Tong Tiangen
2022-05-13 15:31 ` Mark Rutland
2022-05-19 6:53 ` Tong Tiangen
2022-04-20 3:04 ` [PATCH -next v4 5/7] arm64: mte: Clean up user tag accessors Tong Tiangen
2022-05-13 15:36 ` Mark Rutland
2022-04-20 3:04 ` [PATCH -next v4 6/7] arm64: add {get, put}_user to machine check safe Tong Tiangen
2022-05-13 15:39 ` Mark Rutland
2022-05-19 7:09 ` Tong Tiangen
2022-04-20 3:04 ` [PATCH -next v4 7/7] arm64: add cow " Tong Tiangen
2022-05-13 15:44 ` Mark Rutland
2022-05-19 10:38 ` Tong Tiangen
2022-04-27 9:09 ` [PATCH -next v4 0/7]arm64: add machine check safe support Tong Tiangen
2022-05-04 19:58 ` (subset) " Catalin Marinas
2022-05-16 18:45 ` Catalin Marinas
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