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arch_rebalance_pgtables call

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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>
This commit is contained in:
Martin Schwidefsky 2008-02-04 22:29:16 -08:00 committed by Linus Torvalds
parent 5e5419734c
commit 08e7d9b557
1 changed files with 5 additions and 1 deletions
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6
mm/mmap.c
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@ -36,6 +36,10 @@
#define arch_mmap_check(addr, len, flags) (0) #define arch_mmap_check(addr, len, flags) (0)
#endif #endif
#ifndef arch_rebalance_pgtables
#define arch_rebalance_pgtables(addr, len) (addr)
#endif
static void unmap_region(struct mm_struct *mm, static void unmap_region(struct mm_struct *mm,
struct vm_area_struct *vma, struct vm_area_struct *prev, struct vm_area_struct *vma, struct vm_area_struct *prev,
unsigned long start, unsigned long end); 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) if (addr & ~PAGE_MASK)
return -EINVAL; return -EINVAL;
return addr; return arch_rebalance_pgtables(addr, len);
} }
EXPORT_SYMBOL(get_unmapped_area); EXPORT_SYMBOL(get_unmapped_area);