Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1278218

reservation.h: build error with lockdep disabled

Show all headers | View raw

As of 3c3b177a9369 ("reservation: add suppport for read-only access
using rcu") linux/reservation.h uses lockdep macros:

+#define reservation_object_held(obj) lockdep_is_held(&(obj)->lock.base)

This results in build errors when lockdep is disabled as lockdep_is_held()
is only available when lockdep is enabled.  This has been reported today
to break the etnaviv kernel driver, which we're hoping to submit for 4.5.

As this gets used with rcu_dereference_protected(), eg:

static inline struct reservation_object_list *
reservation_object_get_list(struct reservation_object *obj)
{
        return rcu_dereference_protected(obj->fence,
                                         reservation_object_held(obj));
}

I'm guessing that it's not going to be a simple case of making it always
return true or always return false.

Any ideas how to solve this?

-- 
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

reservation.h: build error with lockdep disabled Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-11-26 14:50 +0100
  Re: reservation.h: build error with lockdep disabled "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-11-26 16:30 +0100

csiph-web