hugetlb: fix clear_user_highpage arguments

The virtual address space argument of clear_user_highpage is supposed to be
the virtual address where the page being cleared will eventually be mapped.
 This allows architectures with virtually indexed caches a few clever
tricks.  That sort of trick falls over in painful ways if the virtual
address argument is wrong.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 84c795e..eab8c42 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -42,7 +42,7 @@ static void clear_huge_page(struct page *page, unsigned long addr)
        might_sleep();
        for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); i++) {
                cond_resched();
-               clear_user_highpage(page + i, addr);
+               clear_user_highpage(page + i, addr + i * PAGE_SIZE);
        }
 }