[17/18] Virtual compound page freeing in interrupt context

[Christoph Lameter <clameter@sgi.com>]

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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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