linux-kernel - Re: [PATCH 2/2] mips: mm: Discard ioremap_uncached

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Message-ID: <20180711135210.GA18730@mobilestation>
Date:   Wed, 11 Jul 2018 16:52:10 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     ralf@...ux-mips.org, paul.burton@...s.com, jhogan@...nel.org,
        okaya@...eaurora.org, chenhc@...ote.com,
        Sergey.Semin@...latforms.ru, linux-mips@...ux-mips.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] mips: mm: Discard ioremap_uncached_accelerated()
 method

Hello Christoph,

On Tue, Jul 10, 2018 at 11:56:31PM -0700, Christoph Hellwig <hch@...radead.org> wrote:
> > + * This is a MIPS specific ioremap variant. ioremap_cacheable_cow
> > + * requests a cachable mapping with CWB attribute enabled.
> >   */
> >  #define ioremap_cacheable_cow(offset, size)				\
> >  	__ioremap_mode((offset), (size), _CACHE_CACHABLE_COW)
> 
> This isn't actually used anywhere in the kernel tree.  Please remove it
> as well.

I don't really know whether it is necessary at this point. We discarded the 
ioremap_uncached_accelerated() method, since the obvious alternative is now
available: ioremap_wc(). While ioremap_cacheable_cow() hasn't got one.
So if it was up to me, I'd leave it here. Anyway if the subsystem maintainers
think otherwise, I won't refuse to submit a patch with this method removal.

Regards,
-Sergey