From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 3/4] ARM: mm: truncate memory banks to fit in 4GB space for classic MMU
Date: Wed, 11 Apr 2012 16:52:32 +0100 [thread overview]
Message-ID: <20120411155232.GA24211@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <alpine.LFD.2.02.1204111038130.16314@xanadu.home>
On Wed, Apr 11, 2012 at 10:44:22AM -0400, Nicolas Pitre wrote:
> On Wed, 11 Apr 2012, Will Deacon wrote:
>
> > If a bank of memory spanning the 4GB boundary is added on a !CONFIG_LPAE
> > kernel then we will hang early during boot since the memory bank will
> > have wrapped around to zero.
> >
> > This patch truncates memory banks for !LPAE configurations when the end
> > address is not representable in 32 bits.
> >
> > Cc: Nicolas Pitre <nico@fluxnic.net>
> > Signed-off-by: Will Deacon <will.deacon@arm.com>
>
> Acked-by: Nicolas Pitre <nico@linaro.org>
>
> Now what if start = 1G and size = 5G? The size variable is an unsigned
> long, meaning that right now the size might be truncated to 1G.
There's a solution to that which is quite easy to do: convert the bank
information to PFNs instead of addresses. That will probably eliminate
some corner cases with partial pages which would be desirable too.
next prev parent reply other threads:[~2012-04-11 15:52 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-11 14:30 [PATCH v2 0/4] Miscellaneous nommu fixes Will Deacon
2012-04-11 14:30 ` [PATCH v2 1/4] ARM: nommu: fix typo in mm/Kconfig Will Deacon
2012-04-11 14:30 ` [PATCH v2 2/4] ARM: suspend: fix CPU suspend code for !CONFIG_MMU configurations Will Deacon
2012-04-11 14:30 ` [PATCH v2 3/4] ARM: mm: truncate memory banks to fit in 4GB space for classic MMU Will Deacon
2012-04-11 14:44 ` Nicolas Pitre
2012-04-11 15:07 ` Will Deacon
2012-04-11 15:52 ` Russell King - ARM Linux [this message]
2012-04-11 16:27 ` Russell King - ARM Linux
2012-04-11 17:26 ` David Brown
2012-04-11 17:38 ` Daniel Walker
2012-04-11 17:40 ` Russell King - ARM Linux
2012-04-11 18:06 ` Daniel Walker
2012-04-11 14:30 ` [PATCH v2 4/4] ARM: nommu: populate vectors page from paging_init Will Deacon
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