linux-kernel - Re: [PATCH RFC v1 2/6] swiotlb: convert variables to arrays

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Message-ID: <20210204072947.GA29812@lst.de>
Date:   Thu, 4 Feb 2021 08:29:47 +0100
From:   Christoph Hellwig <hch@....de>
To:     Dongli Zhang <dongli.zhang@...cle.com>
Cc:     dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        iommu@...ts.linux-foundation.org, linux-mips@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-pci@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, nouveau@...ts.freedesktop.org,
        x86@...nel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
        akpm@...ux-foundation.org, benh@...nel.crashing.org,
        bskeggs@...hat.com, bhelgaas@...gle.com, bp@...en8.de,
        boris.ostrovsky@...cle.com, hch@....de, chris@...is-wilson.co.uk,
        daniel@...ll.ch, airlied@...ux.ie, hpa@...or.com, mingo@...nel.org,
        mingo@...hat.com, jani.nikula@...ux.intel.com,
        joonas.lahtinen@...ux.intel.com, jgross@...e.com,
        konrad.wilk@...cle.com, m.szyprowski@...sung.com,
        matthew.auld@...el.com, mpe@...erman.id.au, rppt@...nel.org,
        paulus@...ba.org, peterz@...radead.org, robin.murphy@....com,
        rodrigo.vivi@...el.com, sstabellini@...nel.org,
        bauerman@...ux.ibm.com, tsbogend@...ha.franken.de,
        tglx@...utronix.de, ulf.hansson@...aro.org, joe.jin@...cle.com,
        thomas.lendacky@....com, Claire Chang <tientzu@...omium.org>
Subject: Re: [PATCH RFC v1 2/6] swiotlb: convert variables to arrays

On Wed, Feb 03, 2021 at 03:37:05PM -0800, Dongli Zhang wrote:
> This patch converts several swiotlb related variables to arrays, in
> order to maintain stat/status for different swiotlb buffers. Here are
> variables involved:
> 
> - io_tlb_start and io_tlb_end
> - io_tlb_nslabs and io_tlb_used
> - io_tlb_list
> - io_tlb_index
> - max_segment
> - io_tlb_orig_addr
> - no_iotlb_memory
> 
> There is no functional change and this is to prepare to enable 64-bit
> swiotlb.

Claire Chang (on Cc) already posted a patch like this a month ago,
which looks much better because it actually uses a struct instead
of all the random variables.