Commit-ID: 172708d002e0a2aca032b04fe6f2b8525c29244a
Gitweb: http://git.kernel.org/tip/172708d002e0a2aca032b04fe6f2b8525c29244a
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 16 May 2012 15:23:45 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon, 2 Jul 2012 12:34:22 -0700
rcu: Add a gcc-style structure initializer for RCU pointers
RCU_INIT_POINTER() returns a value that is never used, and which should
be abolished due to terminal ugliness:
q = RCU_INIT_POINTER(global_p, p);
However, there are two uses that cannot be handled by a do-while
formulation because they do gcc-style initialization:
RCU_INIT_POINTER(.real_cred, &init_cred),
RCU_INIT_POINTER(.cred, &init_cred),
This usage is clever, but not necessarily the nicest approach.
This commit therefore creates an RCU_POINTER_INITIALIZER() macro that
is specifically designed for gcc-style initialization.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Acked-by: David Howells <dhowells@xxxxxxxxxx>
---
include/linux/rcupdate.h | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 9cac722..ffe24c0 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -905,6 +905,14 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
#define RCU_INIT_POINTER(p, v) \
p = (typeof(*v) __force __rcu *)(v)
+/**
+ * RCU_POINTER_INITIALIZER() - statically initialize an RCU protected pointer
+ *
+ * GCC-style initialization for an RCU-protected pointer in a structure field.
+ */
+#define RCU_POINTER_INITIALIZER(p, v) \
+ .p = (typeof(*v) __force __rcu *)(v)
+
static __always_inline bool __is_kfree_rcu_offset(unsigned long offset)
{
return offset < 4096;
--
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