From: Mark Rutland <mark.rutland@arm.com>
Date: Tue, 30 Aug 2011 16:45:10 +0000 (+0100)
Subject: ARM: 7067/1: mm: keep significant bits in pfn_valid
X-Git-Tag: v3.1-rc6~10^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fb492c9160f3d40d09456a79cc669fba74d7d9cc;p=pandora-kernel.git

ARM: 7067/1: mm: keep significant bits in pfn_valid

When ARCH_HAS_HOLES_MEMORYMODEL is selected, pfn_valid calls
memblock_is_memory to test validity of a pfn:

> memblock_is_memory(pfn << PAGE_SHIFT);

On LPAE systems this cuts off the top bits, as the shift occurs before
the value is promoted to a phys_addr_t.

This patch replaces the shift with a call to __pfn_to_phys (which casts
pfn to phys_addr_t before shifting), preventing the loss of significant
bits.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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