linux-kernel - Re: [PATCH V1 00/10] Remove duplicated kmap code

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Date:   Fri, 1 May 2020 10:18:28 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christian Koenig <christian.koenig@....com>,
        Huang Rui <ray.huang@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        dri-devel@...ts.freedesktop.org,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        "H. Peter Anvin" <hpa@...or.com>, sparclinux@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Helge Deller <deller@....de>, x86@...nel.org,
        linux-csky@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        linux-snps-arc@...ts.infradead.org, linux-xtensa@...ux-xtensa.org,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-arm-kernel@...ts.infradead.org,
        Chris Zankel <chris@...kel.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-parisc@...r.kernel.org, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH V1 00/10] Remove duplicated kmap code

On Fri, May 01, 2020 at 01:54:56AM -0700, Christoph Hellwig wrote:
> In addition to the work already it the series, it seems like
> LAST_PKMAP_MASK, PKMAP_ADDR and PKMAP_NR can also be consolidated
> to common code.

Agreed, I mentioned in the cover letter there are similarities...

> 
> Also kmap_atomic_high_prot / kmap_atomic_pfn could move into common
> code, maybe keyed off a symbol selected by the actual users that
> need it.  It also seems like it doesn't actually ever need to be
> exported.

...  but these are not as readily obvious, at least to me.  I do see a pattern
but the differences seemed subtle enough that it would take a while to ensure
correctness.  So I'd like to see this series go in and build on it.

> 
> This in turn would lead to being able to allow io_mapping_map_atomic_wc
> on all architectures, which might make nouveau and qxl happy, but maybe
> that can be left for another series.

I agree, that this should be follow on patches.  I still need to fix the
bisect-ability and I don't want to bog down 0-day with a longer series.

Thanks for the review!
Ira