[patch 3/6] arch_update_pgd call

[Martin Schwidefsky <schwidefsky@de.ibm.com>]

[-- Attachment #1: 003-mm-update-pgd.diff --]
[-- Type: text/plain, Size: 1351 bytes --]

In order to change the layout of the page tables after an mmap has
crossed the adress space limit of the current page table layout a
architecture hook in get_unmapped_area is needed. The arguments
are the address of the new mapping and the length of it.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 mm/mmap.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: quilt-2.6/mm/mmap.c
===================================================================
--- quilt-2.6.orig/mm/mmap.c
+++ quilt-2.6/mm/mmap.c
@@ -36,6 +36,10 @@
 #define arch_mmap_check(addr, len, flags)	(0)
 #endif
 
+#ifndef arch_update_pgd
+#define arch_update_pgd(addr, len)		(addr)
+#endif
+
 static void unmap_region(struct mm_struct *mm,
 		struct vm_area_struct *vma, struct vm_area_struct *prev,
 		unsigned long start, unsigned long end);
@@ -1420,7 +1424,7 @@ get_unmapped_area(struct file *file, uns
 	if (addr & ~PAGE_MASK)
 		return -EINVAL;
 
-	return addr;
+	return arch_update_pgd(addr, len);
 }
 
 EXPORT_SYMBOL(get_unmapped_area);

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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