linux-kernel - Re: [PATCH 09/10] arch: introduce memremap()

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Date:	Wed, 22 Jul 2015 18:02:58 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
	Tony Luck <tony.luck@...el.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"Kani, Toshimitsu" <toshi.kani@...com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Christoph Hellwig <hch@....de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 09/10] arch: introduce memremap()

On Wed, Jul 22, 2015 at 5:55 PM, Luis R. Rodriguez <mcgrof@...e.com> wrote:
> On Wed, Jul 22, 2015 at 04:15:41PM -0700, Dan Williams wrote:
> Anyway so why is WB and WT allowed if you are going to remove WC and not add UC?
>

Because all existing usages of WB and WT mappings are clearly free of
I/O side effect concerns.  The WC and now UC usages are a muddy mix of
"sometimes there's I/O side effects, but it depends by arch and
driver".
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