[Xen-devel] [PATCH] xen/arm: io: add function swap_mmio_handler()

[Baodong Chen <chenbaodong@xxxxxxxxxx>]

Swap function can be used when calling sort().
or else, the default swap function generic_swap() is used,
which is a little inefficient.

Signed-off-by: Baodong Chen <chenbaodong@xxxxxxxxxx>
---
 xen/arch/arm/io.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/io.c b/xen/arch/arm/io.c
index ae7ef96..5ce7dc4 100644
--- a/xen/arch/arm/io.c
+++ b/xen/arch/arm/io.c
@@ -92,6 +92,17 @@ static int cmp_mmio_handler(const void *key, const void 
*elem)
     return 0;
 }
 
+static void swap_mmio_handler(void *a, void *b, int size)
+{
+    struct mmio_handler *handler0 = a;
+    struct mmio_handler *handler1 = b;
+    struct mmio_handler tmp;
+
+    tmp = *handler0;
+    *handler0 = *handler1;
+    *handler1 = tmp;
+}
+
 static const struct mmio_handler *find_mmio_handler(struct domain *d,
                                                     paddr_t gpa)
 {
@@ -174,7 +185,7 @@ void register_mmio_handler(struct domain *d,
 
     /* Sort mmio handlers in ascending order based on base address */
     sort(vmmio->handlers, vmmio->num_entries, sizeof(struct mmio_handler),
-         cmp_mmio_handler, NULL);
+         cmp_mmio_handler, swap_mmio_handler);
 
     write_unlock(&vmmio->lock);
 }
-- 
2.7.4


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