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    Subject[17/18] Virtual compound page freeing in interrupt context
    If we are in an interrupt context then simply defer the free via a workqueue.

    Removing a virtual mappping *must* be done with interrupts enabled
    since tlb_xx functions are called that rely on interrupts for
    processor to processor communications.

    Signed-off-by: Christoph Lameter <clameter@sgi.com>

    ---
    mm/page_alloc.c | 12 +++++++++++-
    1 file changed, 11 insertions(+), 1 deletion(-)

    Index: linux-2.6/mm/page_alloc.c
    ===================================================================
    --- linux-2.6.orig/mm/page_alloc.c 2007-10-03 20:00:37.000000000 -0700
    +++ linux-2.6/mm/page_alloc.c 2007-10-03 20:01:09.000000000 -0700
    @@ -294,10 +294,20 @@ static void __free_vcompound(void *addr)
    kfree(pages);
    }

    +static void vcompound_free_work(struct work_struct *w)
    +{
    + __free_vcompound((void *)w);
    +}

    static void free_vcompound(void *addr)
    {
    - __free_vcompound(addr);
    + struct work_struct *w = addr;
    +
    + if (irqs_disabled() || in_interrupt()) {
    + INIT_WORK(w, vcompound_free_work);
    + schedule_work(w);
    + } else
    + __free_vcompound(w);
    }

    static void free_compound_page(struct page *page)
    --
    -
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