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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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