From: Christoph Hellwig <hch@lst.de>
To: "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>
Cc: Christoph Hellwig <hch@lst.de>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"robin.murphy@arm.com" <robin.murphy@arm.com>,
"m.szyprowski@samsung.com" <m.szyprowski@samsung.com>,
Linuxarm <linuxarm@huawei.com>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>,
"xuwei (O)" <xuwei5@huawei.com>, Joerg Roedel <joro@8bytes.org>,
Will Deacon <will@kernel.org>, Shuah Khan <shuah@kernel.org>
Subject: Re: [PATCH v3 1/2] dma-mapping: add benchmark support for streaming DMA APIs
Date: Sun, 15 Nov 2020 09:45:15 +0100 [thread overview]
Message-ID: <20201115084515.GA18411@lst.de> (raw)
In-Reply-To: <5c4488dd28fc4869b7e67dd842ffa208@hisilicon.com>
On Sun, Nov 15, 2020 at 12:11:15AM +0000, Song Bao Hua (Barry Song) wrote:
>
> Checkpatch has changed 80 to 100. That's probably why my local checkpatch didn't report any warning:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bdc48fa11e46f867ea4d
>
> I am happy to change them to be less than 80 if you like.
Don't rely on checkpath, is is broken. Look at the codingstyle document.
> > I think this needs to set a dma mask as behavior for unlimited dma
> > mask vs the default 32-bit one can be very different.
>
> I actually prefer users bind real devices with real dma_mask to test rather than force to change
> the dma_mask in this benchmark.
The mask is set by the driver, not the device. So you need to set when
when you bind, real device or not.
next prev parent reply other threads:[~2020-11-15 8:45 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-02 8:06 [PATCH v3 0/2] dma-mapping: provide a benchmark for streaming DMA mapping Barry Song
2020-11-02 8:06 ` [PATCH v3 1/2] dma-mapping: add benchmark support for streaming DMA APIs Barry Song
2020-11-02 9:18 ` John Garry
2020-11-02 9:37 ` Song Bao Hua (Barry Song)
2020-11-10 8:10 ` Song Bao Hua (Barry Song)
2020-11-10 8:38 ` John Garry
2020-11-11 1:29 ` Song Bao Hua (Barry Song)
[not found] ` <51f0c148-e2e3-e084-4021-ec5883919436@huawei.com>
2020-11-11 9:42 ` Song Bao Hua (Barry Song)
2020-11-14 16:53 ` Christoph Hellwig
2020-11-15 0:11 ` Song Bao Hua (Barry Song)
2020-11-15 8:45 ` Christoph Hellwig [this message]
2020-11-15 21:54 ` Song Bao Hua (Barry Song)
2020-11-02 8:06 ` [PATCH v3 2/2] selftests/dma: add test application for DMA_MAP_BENCHMARK Barry Song
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