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

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Date:	Tue, 21 Jul 2015 09:07:21 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Thomas Gleixner <tglx@...utronix.de>
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 Tue, 2015-07-21 at 16:31 +0200, Thomas Gleixner wrote:
> 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? 

They are the callers I noticed.

 - Multiple ioremap calls from arch/x86/kernel/kdebugfs.c.
 - Multiple ioremap calls from arch/x86/kernel/ksysfs.c.
 - pcibios_add_device()

Thanks,
-Toshi


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