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authorAndreas Gruenbacher <agruen@linbit.com>2011-07-06 10:57:39 +0200
committerPhilipp Reisner <philipp.reisner@linbit.com>2014-02-17 16:45:02 +0100
commit3b52beffc57d6f1498a29d4edcb1cc2ad81241ec (patch)
treeb958a13b5fbf72e668fc5386050a80a8f5b22290 /drivers
parentd01801710265cfb7bd8928ae7c3be4d9d15ceeb0 (diff)
drbd: Turn drbd_printk() into a polymorphic macro
This allows drbd_alert(), drbd_err(), drbd_warn(), and drbd_info() to work for a resource, device, or connection so that we don't have to introduce three separate sets of macros for that. The drbd_printk() macro itself is pretty ugly, but that problem is limited to one place in the code. Using drbd_printk() on an object type which it doesn't understand results in an undefined drbd_printk_with_wrong_object_type symbol. Signed-off-by: Andreas Gruenbacher <agruen@linbit.com> Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/drbd/drbd_int.h58
1 files changed, 43 insertions, 15 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index d393f0bc26fb..06262f5389d0 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -100,21 +100,49 @@ extern char usermode_helper[];
struct drbd_device;
struct drbd_connection;
-#define drbd_printk(level, device, fmt, args...) \
- dev_printk(level, disk_to_dev(device->vdisk), fmt, ## args)
-
-#define drbd_dbg(device, fmt, args...) \
- drbd_printk(KERN_DEBUG, device, fmt, ## args)
-#define drbd_alert(device, fmt, args...) \
- drbd_printk(KERN_ALERT, device, fmt, ## args)
-#define drbd_err(device, fmt, args...) \
- drbd_printk(KERN_ERR, device, fmt, ## args)
-#define drbd_warn(device, fmt, args...) \
- drbd_printk(KERN_WARNING, device, fmt, ## args)
-#define drbd_info(device, fmt, args...) \
- drbd_printk(KERN_INFO, device, fmt, ## args)
-#define drbd_emerg(device, fmt, args...) \
- drbd_printk(KERN_EMERG, device, fmt, ## args)
+#define __drbd_printk_device(level, device, fmt, args...) \
+ dev_printk(level, disk_to_dev((device)->vdisk), fmt, ## args)
+#define __drbd_printk_peer_device(level, peer_device, fmt, args...) \
+ dev_printk(level, disk_to_dev((peer_device)->device->vdisk), fmt, ## args)
+#define __drbd_printk_resource(level, resource, fmt, args...) \
+ printk(level "drbd %s: " fmt, (resource)->name, ## args)
+#define __drbd_printk_connection(level, connection, fmt, args...) \
+ printk(level "drbd %s: " fmt, (connection)->resource->name, ## args)
+
+void drbd_printk_with_wrong_object_type(void);
+
+#define __drbd_printk_if_same_type(obj, type, func, level, fmt, args...) \
+ (__builtin_types_compatible_p(typeof(obj), type) || \
+ __builtin_types_compatible_p(typeof(obj), const type)), \
+ func(level, (const type)(obj), fmt, ## args)
+
+#define drbd_printk(level, obj, fmt, args...) \
+ __builtin_choose_expr( \
+ __drbd_printk_if_same_type(obj, struct drbd_device *, \
+ __drbd_printk_device, level, fmt, ## args), \
+ __builtin_choose_expr( \
+ __drbd_printk_if_same_type(obj, struct drbd_resource *, \
+ __drbd_printk_resource, level, fmt, ## args), \
+ __builtin_choose_expr( \
+ __drbd_printk_if_same_type(obj, struct drbd_connection *, \
+ __drbd_printk_connection, level, fmt, ## args), \
+ __builtin_choose_expr( \
+ __drbd_printk_if_same_type(obj, struct drbd_peer_device *, \
+ __drbd_printk_peer_device, level, fmt, ## args), \
+ drbd_printk_with_wrong_object_type()))))
+
+#define drbd_dbg(obj, fmt, args...) \
+ drbd_printk(KERN_DEBUG, obj, fmt, ## args)
+#define drbd_alert(obj, fmt, args...) \
+ drbd_printk(KERN_ALERT, obj, fmt, ## args)
+#define drbd_err(obj, fmt, args...) \
+ drbd_printk(KERN_ERR, obj, fmt, ## args)
+#define drbd_warn(obj, fmt, args...) \
+ drbd_printk(KERN_WARNING, obj, fmt, ## args)
+#define drbd_info(obj, fmt, args...) \
+ drbd_printk(KERN_INFO, obj, fmt, ## args)
+#define drbd_emerg(obj, fmt, args...) \
+ drbd_printk(KERN_EMERG, obj, fmt, ## args)
#define dynamic_drbd_dbg(device, fmt, args...) \
dynamic_dev_dbg(disk_to_dev(device->vdisk), fmt, ## args)