[PATCH v2] virtio_mem: fix hardcoded 'vm' variable in bbm iteration macros

[lirongqing <lirongqing@baidu.com>]

From: Li RongQing <lirongqing@baidu.com>

virtio_mem_bbm_for_each_bb() and virtio_mem_bbm_for_each_bb_rev()
accept a '_vm' parameter to allow callers to pass any variable name
referring to the virtio_mem instance. However, the 'for' loop
initializer and part of the loop condition use the bare name 'vm'
instead of the macro parameter '_vm'.

Fix by replacing all bare 'vm->' references inside the macros with
the '_vm' parameter, and wrap in parentheses following kernel macro
conventions.

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
---
diff with v1: drop the Fixes tag, since there is no user-visible bug

 drivers/virtio/virtio_mem.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 11c4415..82a285c 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -423,14 +423,14 @@ static int virtio_mem_bbm_bb_states_prepare_next_bb(struct virtio_mem *vm)
 }
 
 #define virtio_mem_bbm_for_each_bb(_vm, _bb_id, _state) \
-	for (_bb_id = vm->bbm.first_bb_id; \
-	     _bb_id < vm->bbm.next_bb_id && _vm->bbm.bb_count[_state]; \
+	for (_bb_id = (_vm)->bbm.first_bb_id; \
+	     _bb_id < (_vm)->bbm.next_bb_id && (_vm)->bbm.bb_count[_state]; \
 	     _bb_id++) \
 		if (virtio_mem_bbm_get_bb_state(_vm, _bb_id) == _state)
 
 #define virtio_mem_bbm_for_each_bb_rev(_vm, _bb_id, _state) \
-	for (_bb_id = vm->bbm.next_bb_id - 1; \
-	     _bb_id >= vm->bbm.first_bb_id && _vm->bbm.bb_count[_state]; \
+	for (_bb_id = (_vm)->bbm.next_bb_id - 1; \
+	     _bb_id >= (_vm)->bbm.first_bb_id && (_vm)->bbm.bb_count[_state]; \
 	     _bb_id--) \
 		if (virtio_mem_bbm_get_bb_state(_vm, _bb_id) == _state)
 
-- 
2.9.4