[patch 51/62] x86: fix kernel_physical_mapping_init() for large x86 systems

[patch 51/62] x86: fix kernel_physical_mapping_init() for large x86 systems

[Greg KH]

[-- Attachment #1: x86-fix-kernel_physical_mapping_init-for-large-x86-systems.patch --]
[-- Type: text/plain, Size: 1242 bytes --]

2.6.26 -stable review patch.  If anyone has any objections, please let
us know.

------------------
From: Ingo Molnar <mingo@elte.hu>

based on e22146e610bb7aed63282148740ab1d1b91e1d90 upstream

Fix bug in kernel_physical_mapping_init() that causes kernel
page table to be built incorrectly for systems with greater
than 512GB of memory.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Cc: linux-mm@kvack.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Oliver Pinter <oliver.pntr@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 arch/x86/mm/init_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -579,7 +579,7 @@ unsigned long __init_refok init_memory_m
 		else
 			pud = alloc_low_page(&pud_phys);
 
-		next = start + PGDIR_SIZE;
+		next = (start + PGDIR_SIZE) & PGDIR_MASK;
 		if (next > end)
 			next = end;
 		last_map_addr = phys_pud_init(pud, __pa(start), __pa(next));

-- 

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