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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-02-05 07:29:16 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 18:44:18 +0100
commit08e7d9b557299ba6ce57165ce8df310780bd681c (patch)
tree8733b402eaa1de1a6bcdea5ee72ea8655c896dd4
parentadd mm argument to pte/pmd/pud/pgd_free (diff)
downloadlinux-08e7d9b557299ba6ce57165ce8df310780bd681c.tar.xz
linux-08e7d9b557299ba6ce57165ce8df310780bd681c.zip
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>
-rw-r--r--mm/mmap.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 8295577a83b2..bb4c963cc534 100644
--- a/mm/mmap.c
+++ b/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);
@@ -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);