lockdep goes off on the iova copy_reserved_iova because it and a
function it calls grabs locks in the from, and the to of the copy
operation.
This patch gives the reserved_ioval_list locks special lockdep classes.
--mgross
Signed-off-by: <[EMAIL PROTECTED]>
Index: linux-2.6.24-mm1/drivers/pci/intel-iommu.c
===================================================================
--- linux-2.6.24-mm1.orig/drivers/pci/intel-iommu.c 2008-02-20
15:52:23.000000000 -0800
+++ linux-2.6.24-mm1/drivers/pci/intel-iommu.c 2008-02-20 16:08:27.000000000
-0800
@@ -1127,6 +1127,8 @@
}
static struct iova_domain reserved_iova_list;
+static struct lock_class_key reserved_alloc_key;
+static struct lock_class_key reserved_rbtree_key;
static void dmar_init_reserved_ranges(void)
{
@@ -1137,6 +1139,11 @@
init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN);
+ lockdep_set_class(&reserved_iova_list.iova_alloc_lock,
+ &reserved_alloc_key);
+ lockdep_set_class(&reserved_iova_list.iova_rbtree_lock,
+ &reserved_rbtree_key);
+
/* IOAPIC ranges shouldn't be accessed by DMA */
iova = reserve_iova(&reserved_iova_list, IOVA_PFN(IOAPIC_RANGE_START),
IOVA_PFN(IOAPIC_RANGE_END));
--
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