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    Subject[patch 16/16] x86_64: Don't look up struct page pointer of physical address in iounmap
    [PATCH] x86_64: Don't look up struct page pointer of physical address in iounmap

    It could be in a memory hole not mapped in mem_map and that causes the hash
    lookup to go off to nirvana.

    Back port to -stable tree by Chris Wright

    Signed-off-by: Andi Kleen <ak@suse.de>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>
    Signed-off-by: Chris Wright <chrisw@osdl.org>
    ---

    ioremap.c | 2 +-
    1 files changed, 1 insertion(+), 1 deletion(-)

    Index: release-2.6.11/arch/x86_64/mm/ioremap.c
    ===================================================================
    --- release-2.6.11.orig/arch/x86_64/mm/ioremap.c
    +++ release-2.6.11/arch/x86_64/mm/ioremap.c
    @@ -266,7 +266,7 @@ void iounmap(volatile void __iomem *addr
    if ((p->flags >> 20) &&
    p->phys_addr + p->size - 1 < virt_to_phys(high_memory)) {
    /* p->size includes the guard page, but cpa doesn't like that */
    - change_page_attr(virt_to_page(__va(p->phys_addr)),
    + change_page_attr_addr((unsigned long)(__va(p->phys_addr)),
    (p->size - PAGE_SIZE) >> PAGE_SHIFT,
    PAGE_KERNEL);
    global_flush_tlb();
    -
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