linux-kernel - Re: swiotlb/caamjr regression (Was: [GIT PULL] (swiotlb) stable/for-linus-5.12)

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Message-ID: <YNASOEGsDxhFC8qJ@atmark-techno.com>
Date:   Mon, 21 Jun 2021 13:14:48 +0900
From:   'Dominique MARTINET' <dominique.martinet@...ark-techno.com>
To:     Chanho Park <chanho61.park@...sung.com>
Cc:     'Jianxiong Gao' <jxgao@...gle.com>,
        'Christoph Hellwig' <hch@....de>,
        'Konrad Rzeszutek Wilk' <konrad@...nok.org>,
        'Konrad Rzeszutek Wilk' <konrad.wilk@...cle.com>,
        'Linus Torvalds' <torvalds@...ux-foundation.org>,
        'Horia Geantă' <horia.geanta@....com>,
        linux-kernel@...r.kernel.org, 'Lukas Hartmann' <lukas@...mn.com>,
        'Aymen Sghaier' <aymen.sghaier@....com>,
        'Herbert Xu' <herbert@...dor.apana.org.au>,
        "'David S. Miller'" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, iommu@...ts.linux-foundation.org,
        'Marc Orr' <marcorr@...gle.com>,
        'Erdem Aktas' <erdemaktas@...gle.com>,
        'Peter Gonda' <pgonda@...gle.com>,
        'Bumyong Lee' <bumyong.lee@...sung.com>
Subject: Re: swiotlb/caamjr regression (Was: [GIT PULL] (swiotlb)
 stable/for-linus-5.12)

Chanho Park wrote on Mon, Jun 21, 2021 at 11:55:22AM +0900:
> Sure. No problem. But, the patch was already stacked on Konrad's tree
> and linux-next as well.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb.git/commit/?h=devel/for-linus-5.14&id=33d1641f38f0c327bc3e5c21de585c77a6512bc6 

That patch is slightly different, it's a rewrite Konrad did that mixes
in Linus' suggestion[1], which breaks things for the NVMe usecase
Jianxiong Gao has.

[1] offset = (tlb_addr - mem->start) & (IO_TLB_SIZE - 1)


Konrad is aware so I think it shouldn't be submitted :)

-- 
Dominique