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drbd: fix function cast warnings in state machine
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There are four state machines in drbd that use a common infrastructure, with
a cast to an incompatible function type in REMEMBER_STATE_CHANGE that clang-16
now warns about:

drivers/block/drbd/drbd_state.c:1632:3: error: cast from 'int (*)(struct sk_buff *, unsigned int, struct drbd_resource_state_change *, enum drbd_notification_type)' to 'typeof (last_func)' (aka 'int (*)(struct sk_buff *, unsigned int, void *, enum drbd_notification_type)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
 1632 |                 REMEMBER_STATE_CHANGE(notify_resource_state_change,
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1633 |                                       resource_state_change, NOTIFY_CHANGE);
      |                                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/block/drbd/drbd_state.c:1619:17: note: expanded from macro 'REMEMBER_STATE_CHANGE'
 1619 |            last_func = (typeof(last_func))func; \
      |                        ^~~~~~~~~~~~~~~~~~~~~~~
drivers/block/drbd/drbd_state.c:1641:4: error: cast from 'int (*)(struct sk_buff *, unsigned int, struct drbd_connection_state_change *, enum drbd_notification_type)' to 'typeof (last_func)' (aka 'int (*)(struct sk_buff *, unsigned int, void *, enum drbd_notification_type)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
 1641 |                         REMEMBER_STATE_CHANGE(notify_connection_state_change,
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1642 |                                               connection_state_change, NOTIFY_CHANGE);
      |                                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Change these all to actually expect a void pointer to be passed, which
matches the caller.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20240213100354.457128-1-arnd@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Arnd Bergmann authored and Jens Axboe committed Feb 13, 2024
1 parent 7789bf0 commit fe0b1e9
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Showing 2 changed files with 18 additions and 14 deletions.
24 changes: 14 additions & 10 deletions drivers/block/drbd/drbd_state.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1542,9 +1542,10 @@ int drbd_bitmap_io_from_worker(struct drbd_device *device,

int notify_resource_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_resource_state_change *resource_state_change,
void *state_change,
enum drbd_notification_type type)
{
struct drbd_resource_state_change *resource_state_change = state_change;
struct drbd_resource *resource = resource_state_change->resource;
struct resource_info resource_info = {
.res_role = resource_state_change->role[NEW],
Expand All @@ -1558,23 +1559,25 @@ int notify_resource_state_change(struct sk_buff *skb,

int notify_connection_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_connection_state_change *connection_state_change,
void *state_change,
enum drbd_notification_type type)
{
struct drbd_connection *connection = connection_state_change->connection;
struct drbd_connection_state_change *p = state_change;
struct drbd_connection *connection = p->connection;
struct connection_info connection_info = {
.conn_connection_state = connection_state_change->cstate[NEW],
.conn_role = connection_state_change->peer_role[NEW],
.conn_connection_state = p->cstate[NEW],
.conn_role = p->peer_role[NEW],
};

return notify_connection_state(skb, seq, connection, &connection_info, type);
}

int notify_device_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_device_state_change *device_state_change,
void *state_change,
enum drbd_notification_type type)
{
struct drbd_device_state_change *device_state_change = state_change;
struct drbd_device *device = device_state_change->device;
struct device_info device_info = {
.dev_disk_state = device_state_change->disk_state[NEW],
Expand All @@ -1585,9 +1588,10 @@ int notify_device_state_change(struct sk_buff *skb,

int notify_peer_device_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_peer_device_state_change *p,
void *state_change,
enum drbd_notification_type type)
{
struct drbd_peer_device_state_change *p = state_change;
struct drbd_peer_device *peer_device = p->peer_device;
struct peer_device_info peer_device_info = {
.peer_repl_state = p->repl_state[NEW],
Expand All @@ -1605,8 +1609,8 @@ static void broadcast_state_change(struct drbd_state_change *state_change)
struct drbd_resource_state_change *resource_state_change = &state_change->resource[0];
bool resource_state_has_changed;
unsigned int n_device, n_connection, n_peer_device, n_peer_devices;
int (*last_func)(struct sk_buff *, unsigned int, void *,
enum drbd_notification_type) = NULL;
int (*last_func)(struct sk_buff *, unsigned int,
void *, enum drbd_notification_type) = NULL;
void *last_arg = NULL;

#define HAS_CHANGED(state) ((state)[OLD] != (state)[NEW])
Expand All @@ -1616,7 +1620,7 @@ static void broadcast_state_change(struct drbd_state_change *state_change)
})
#define REMEMBER_STATE_CHANGE(func, arg, type) \
({ FINAL_STATE_CHANGE(type | NOTIFY_CONTINUES); \
last_func = (typeof(last_func))func; \
last_func = func; \
last_arg = arg; \
})

Expand Down
8 changes: 4 additions & 4 deletions drivers/block/drbd/drbd_state_change.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -46,19 +46,19 @@ extern void forget_state_change(struct drbd_state_change *);

extern int notify_resource_state_change(struct sk_buff *,
unsigned int,
struct drbd_resource_state_change *,
void *,
enum drbd_notification_type type);
extern int notify_connection_state_change(struct sk_buff *,
unsigned int,
struct drbd_connection_state_change *,
void *,
enum drbd_notification_type type);
extern int notify_device_state_change(struct sk_buff *,
unsigned int,
struct drbd_device_state_change *,
void *,
enum drbd_notification_type type);
extern int notify_peer_device_state_change(struct sk_buff *,
unsigned int,
struct drbd_peer_device_state_change *,
void *,
enum drbd_notification_type type);

#endif /* DRBD_STATE_CHANGE_H */

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