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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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