linux-kernel - Re: [PATCH v2 2/4] devm: fix ioremap

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Message-ID: <CAPcyv4g30QqO2+vmhfFi6Mw3pku=BkEmvUbzxMme4nm8SkHyrQ@mail.gmail.com>
Date:	Sat, 30 May 2015 14:16:28 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Juergen Gross <jgross@...e.com>, X86 ML <x86@...nel.org>,
	"Kani, Toshimitsu" <toshi.kani@...com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Luis Rodriguez <mcgrof@...e.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefan Bader <stefan.bader@...onical.com>,
	Andy Lutomirski <luto@...capital.net>, linux-mm@...ck.org,
	geert@...ux-m68k.org, Henrique de Moraes Holschuh <hmh@....eng.br>,
	Tejun Heo <tj@...nel.org>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 2/4] devm: fix ioremap_cache() usage

On Sat, May 30, 2015 at 1:52 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Saturday 30 May 2015, Dan Williams wrote:
>> @@ -154,7 +148,7 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
>>         }
>>
>>         if (res->flags & IORESOURCE_CACHEABLE)
>> -               dest_ptr = devm_ioremap(dev, res->start, size);
>> +               dest_ptr = devm_ioremap_cache(dev, res->start, size);
>>         else
>>                 dest_ptr = devm_ioremap_nocache(dev, res->start, size);
>
> I think the existing uses of IORESOURCE_CACHEABLE are mostly bugs, so changing
> the behavior here may cause more problems than it solves.
>

Ok, but that effectively makes devm_ioremap_resource() unusable for
the cached case.  How about introducing devm_ioremap_cache_resource(),
and cleaning up devm_ioremap_resource() to stop pretending that it is
honoring the memory type of the resource?
--
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