rcu: add g_free_rcu
This simplifies calling g_free from an RCU callback.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/docs/rcu.txt b/docs/rcu.txt
index 61752b9..21ecb81 100644
--- a/docs/rcu.txt
+++ b/docs/rcu.txt
@@ -120,12 +120,15 @@
void call_rcu(T *p,
void (*func)(T *p),
field-name);
+ void g_free_rcu(T *p,
+ field-name);
- call_rcu1 is typically used through this macro, in the common case
- where the "struct rcu_head" is the first field in the struct. In
- the above case, one could have written simply:
+ call_rcu1 is typically used through these macro, in the common case
+ where the "struct rcu_head" is the first field in the struct. If
+ the callback function is g_free, in particular, g_free_rcu can be
+ used. In the above case, one could have written simply:
- call_rcu(foo_reclaim, g_free, rcu);
+ g_free_rcu(foo_reclaim, rcu);
typeof(*p) atomic_rcu_read(p);
diff --git a/include/qemu/rcu.h b/include/qemu/rcu.h
index 068a279..506ab58 100644
--- a/include/qemu/rcu.h
+++ b/include/qemu/rcu.h
@@ -140,6 +140,14 @@
}), \
(RCUCBFunc *)(func))
+#define g_free_rcu(obj, field) \
+ call_rcu1(({ \
+ char __attribute__((unused)) \
+ offset_must_be_zero[-offsetof(typeof(*(obj)), field)]; \
+ &(obj)->field; \
+ }), \
+ (RCUCBFunc *)g_free);
+
#ifdef __cplusplus
}
#endif
