Messages in this thread Patch in this message | | | Date | Mon, 12 Nov 2007 15:30:12 +0100 | From | schwidefsky@de ... | Subject | [patch 3/3] arch_rebalance_pgtables call |
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From: Martin Schwidefsky <schwidefsky@de.ibm.com>
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> ---
mm/mmap.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
Index: linux-2.6/mm/mmap.c =================================================================== --- linux-2.6.orig/mm/mmap.c +++ linux-2.6/mm/mmap.c @@ -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); @@ -1436,7 +1440,7 @@ get_unmapped_area(struct file *file, uns if (addr & ~PAGE_MASK) return -EINVAL; - return addr; + return arch_rebalance_pgtables(addr, len); } EXPORT_SYMBOL(get_unmapped_area); -- blue skies, Martin.
"Reality continues to ruin my life." - Calvin.
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