linux-kernel - Re: [PATCH v1 10/10] powerpc/mm: refactor ioremap_range() and use ioremap_page

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Date:   Tue, 13 Aug 2019 23:30:49 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, npiggin@...il.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 10/10] powerpc/mm: refactor ioremap_range() and use
 ioremap_page_range()

On Wed, Aug 14, 2019 at 08:23:54AM +0200, Christophe Leroy wrote:
> Le 14/08/2019 à 07:49, Christoph Hellwig a écrit :
> > Somehow this series is missing a cover letter.
> > 
> > While you are touching all this "fun" can you also look into killing
> > __ioremap?  It seems to be a weird non-standard version of ioremap_prot
> > (probably predating ioremap_prot) that is missing a few lines of code
> > setting attributes that might not even be applicable for the two drivers
> > calling it.
> > 
> 
> ocm_init_node() [arch/powerpc/platforms/4xx/ocm.c] calls __ioremap() with
> _PAGE_EXEC set while ioremap_prot() clears _PAGE_EXEC

Indeed.  But I don't see anything marking this intentional.  Then again
the driver is entirely unused, so we might as well kill it off now.