linux-kernel - Re: "arm64: use asm-generic/dma-mapping.h" introduced a kbuild warning

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Message-ID: <32e53c34-6cc5-6231-6069-3b782f5d2cf0@arm.com>
Date:   Fri, 20 Sep 2019 14:42:42 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Qian Cai <cai@....pw>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Will Deacon <will@...nel.org>, Christoph Hellwig <hch@....de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: "arm64: use asm-generic/dma-mapping.h" introduced a kbuild
 warning

On 20/09/2019 14:18, Qian Cai wrote:
> On Fri, 2019-09-20 at 19:24 +0900, Masahiro Yamada wrote:
>> Hi Qian,
>>
>> On Thu, Sep 19, 2019 at 10:06 PM Qian Cai <cai@....pw> wrote:
>>>
>>> The commit 5489c8e0cf03 ("arm64: use asm-generic/dma-mapping.h") introduced a
>>> kbuild warning,
>>>
>>> scripts/Makefile.asm-generic:25: redundant generic-y found in
>>> arch/arm64/include/asm/Kbuild: dma-mapping.h
>>>
>>>
>>
>> Which tree did you test?
> 
> It was yesterday's linux-next (next-20190918) with this config [1], but it seems
> gone in today's linux-next.

There was a conflict in dma-mapping.h between the arm64 tree and the 
dma-mapping tree (where that commit deleted it) - looks like -next must 
have just resolved it the wrong way that day.

Robin.

> [1] https://raw.githubusercontent.com/cailca/linux-mm/master/arm64.config
> 
>>
>> I tried the latest Linus tree (, which contains 5489c8e0cf03),
>> but I did not see this warning.
>>
>>
>>
> 
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> linux-arm-kernel@...ts.infradead.org
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> 

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