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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-05-16 15:23:45 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-07-02 12:34:22 -0700
commit172708d002e0a2aca032b04fe6f2b8525c29244a (patch)
tree5245232b443036a68ffb2cccdadd797678aeb0c7 /include/linux/rcupdate.h
parent1d1fb395f6dbc07b36285bbedcf01a73b57f7cb5 (diff)
downloadlwn-172708d002e0a2aca032b04fe6f2b8525c29244a.tar.gz
lwn-172708d002e0a2aca032b04fe6f2b8525c29244a.zip
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@linux.vnet.ibm.com> Acked-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 9cac722b169c..ffe24c09e53d 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;