Commit 08e7d9b5 authored Feb 04, 2008 by Martin Schwidefsky Committed by Linus Torvalds Feb 05, 2008

arch_rebalance_pgtables call

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.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 5e541973

mm/mmap.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -36,6 +36,10 @@
		#define arch_mmap_check(addr, len, flags) (0)
		#endif

		#ifndef arch_rebalance_pgtables
		#define arch_rebalance_pgtables(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);
		@@ -1424,7 +1428,7 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
		if (addr & ~PAGE_MASK)
		return -EINVAL;

		return addr;
		return arch_rebalance_pgtables(addr, len);
		}

		EXPORT_SYMBOL(get_unmapped_area);

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