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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>
This commit is contained in:
Paul E. McKenney 2012-05-16 15:23:45 -07:00
parent 1d1fb395f6
commit 172708d002
1 changed files with 8 additions and 0 deletions
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8
include/linux/rcupdate.h
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@ -905,6 +905,14 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
#define RCU_INIT_POINTER(p, v) \ #define RCU_INIT_POINTER(p, v) \
p = (typeof(*v) __force __rcu *)(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) static __always_inline bool __is_kfree_rcu_offset(unsigned long offset)
{ {
return offset < 4096; return offset < 4096;