From: Márton Németh <[email protected]>

The ids field of the struct xenbus_device_id is constant in <linux/xen/xenbus.h>
so it is worth to make blkfront_ids also constant.

The semantic match that finds this kind of pattern is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
disable decl_init,const_decl_init;
identifier I1, I2, x;
@@
        struct I1 {
          ...
          const struct I2 *x;
          ...
        };
@s@
identifier r.I1, y;
identifier r.x, E;
@@
        struct I1 y = {
          .x = E,
        };
@c@
identifier r.I2;
identifier s.E;
@@
        const struct I2 E[] = ... ;
@depends on !c@
identifier r.I2;
identifier s.E;
@@
+       const
        struct I2 E[] = ...;
// </smpl>

Signed-off-by: Márton Németh <[email protected]>
Cc: Julia Lawall <[email protected]>
Cc: [email protected]
---
diff -u -p a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
--- a/drivers/block/xen-blkfront.c 2010-01-07 19:08:39.000000000 +0100
+++ b/drivers/block/xen-blkfront.c 2010-01-08 09:28:49.000000000 +0100
@@ -1050,7 +1050,7 @@ static const struct block_device_operati
 };


-static struct xenbus_device_id blkfront_ids[] = {
+static const struct xenbus_device_id blkfront_ids[] = {
        { "vbd" },
        { "" }
 };
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