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    Subject[13/17] 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 | 23 ++++++++++++++++++++++-
    1 file changed, 22 insertions(+), 1 deletion(-)

    Index: linux-2.6/mm/page_alloc.c
    ===================================================================
    --- linux-2.6.orig/mm/page_alloc.c 2007-09-25 00:20:56.000000000 -0700
    +++ linux-2.6/mm/page_alloc.c 2007-09-25 00:20:57.000000000 -0700
    @@ -1294,7 +1294,12 @@ abort:
    return NULL;
    }

    -static void vcompound_free(void *addr)
    +/*
    + * Virtual Compound freeing functions. This is complicated by the vmalloc
    + * layer not being able to free virtual allocations when interrupts are
    + * disabled. So we defer the frees via a workqueue if necessary.
    + */
    +static void __vcompound_free(void *addr)
    {
    struct page **pages;
    int i;
    @@ -1319,6 +1324,22 @@ static void vcompound_free(void *addr)
    kfree(pages);
    }

    +static void vcompound_free_work(struct work_struct *w)
    +{
    + __vcompound_free((void *)w);
    +}
    +
    +static noinline void vcompound_free(void *addr)
    +{
    + if (in_interrupt()) {
    + struct work_struct *w = addr;
    +
    + INIT_WORK(w, vcompound_free_work);
    + schedule_work(w);
    + } else
    + __vcompound_free(addr);
    +}
    +
    /*
    * This is the 'heart' of the zoned buddy allocator.
    */
    --
    -
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