[PATCH] eventfd: Replace rcu_assign_pointer() with RCU_INIT_POINTER()

[Andreea-Cristina Bernat]

The uses of "rcu_assign_pointer()" are NULLing out the pointers.
According to RCU_INIT_POINTER()'s block comment:
"1.   This use of RCU_INIT_POINTER() is NULLing out the pointer"
it is better to use it instead of rcu_assign_pointer() because it has a
smaller overhead.

The following Coccinelle semantic patch was used:
@@
@@

- rcu_assign_pointer
+ RCU_INIT_POINTER
  (..., NULL)

Signed-off-by: Andreea-Cristina Bernat <bernat....@gmail.com>
---
 virt/kvm/eventfd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 20c3af7..a49130f 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -278,7 +278,7 @@ static void irqfd_update(struct kvm *kvm, struct _irqfd 
*irqfd,
        struct kvm_kernel_irq_routing_entry *e;
 
        if (irqfd->gsi >= irq_rt->nr_rt_entries) {
-               rcu_assign_pointer(irqfd->irq_entry, NULL);
+               RCU_INIT_POINTER(irqfd->irq_entry, NULL);
                return;
        }
 
@@ -287,7 +287,7 @@ static void irqfd_update(struct kvm *kvm, struct _irqfd 
*irqfd,
                if (e->type == KVM_IRQ_ROUTING_MSI)
                        rcu_assign_pointer(irqfd->irq_entry, e);
                else
-                       rcu_assign_pointer(irqfd->irq_entry, NULL);
+                       RCU_INIT_POINTER(irqfd->irq_entry, NULL);
        }
 }
 
@@ -473,7 +473,7 @@ kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args)
                         * It is paired with synchronize_srcu done by caller
                         * of that function.
                         */
-                       rcu_assign_pointer(irqfd->irq_entry, NULL);
+                       RCU_INIT_POINTER(irqfd->irq_entry, NULL);
                        irqfd_deactivate(irqfd);
                }
        }
-- 
1.9.1

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