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Commit 08e7d9b5 authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Linus Torvalds
Browse files

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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus 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);