CPU hotplug (which will be the first user of per-CPU rwlocks) has a special
requirement with respect to locking: the writer, after acquiring the per-CPU
rwlock for write, must be allowed to take the same lock for read, without
deadlocking and without getting complaints from lockdep. In comparison,
On Mon, Feb 18, 2013 at 8:39 PM, Srivatsa S. Bhat
srivatsa.b...@linux.vnet.ibm.com wrote:
@@ -200,6 +217,16 @@ void percpu_write_lock_irqsave(struct percpu_rwlock
*pcpu_rwlock,
smp_mb(); /* Complete the wait-for-readers, before taking the lock */
On 02/18/2013 09:21 PM, Michel Lespinasse wrote:
On Mon, Feb 18, 2013 at 8:39 PM, Srivatsa S. Bhat
srivatsa.b...@linux.vnet.ibm.com wrote:
@@ -200,6 +217,16 @@ void percpu_write_lock_irqsave(struct percpu_rwlock
*pcpu_rwlock,
smp_mb(); /* Complete the wait-for-readers, before taking
