linux-kernel - Re: [PATCH RESEND 2/3] mm, x86: Remove region_is

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Message-ID: <alpine.DEB.2.11.1507211620250.18576@nanos>
Date:	Tue, 21 Jul 2015 16:31:12 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Toshi Kani <toshi.kani@...com>
cc:	mingo@...hat.com, hpa@...or.com, akpm@...ux-foundation.org,
	travis@....com, roland@...estorage.com, dan.j.williams@...el.com,
	mcgrof@...e.com, x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH RESEND 2/3] mm, x86: Remove region_is_ram() call from
 ioremap

On Thu, 16 Jul 2015, Toshi Kani wrote:
> Note, removing the call to region_is_ram() is also necessary to
> fix bugs in region_is_ram().  walk_system_ram_range() requires
> RAM ranges be page-aligned in the iomem_resource table to work
> properly.  This restriction has allowed multiple ioremaps to RAM
> (setup_data) which are page-unaligned.  Using fixed region_is_ram()
> will cause these callers to start failing.

Which callers? 

Thanks,

	tglx
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