[PATCH] cpumask_t initializers

In the course of another patch I've been working on, I stumbled across
some weirdness with some of the SD_*_INIT sched_domains initializers.  A
day or so of digging narrowed it down to the CPU_MASK_NONE initializer
nested inside the sched_domain initializers.  The errors I got were:

kernel/sched.c:4812: error: initializer element is not constant
kernel/sched.c:4812: error: (near initialization for `sched_domain_dummy')
kernel/sched.c:4812: error: initializer element is not constant

which was this line:

static struct sched_domain sched_domain_dummy = SD_CPU_INIT;

Janis Johnson, a GCC hacker, told me the following:

include/linux/cpumask.h

@@ -234,29 +234,29 @@ static inline int __next_cpu(int n, const cpumask_t *srcp, int nbits)
 #if NR_CPUS <= BITS_PER_LONG
 
 #define CPU_MASK_ALL							\
-((cpumask_t) { {							\
+(cpumask_t) { {								\
 	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD			\
-} })
+} }
 
 #else
 
 #define CPU_MASK_ALL							\
-((cpumask_t) { {							\
+(cpumask_t) { {								\
 	[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL,			\
 	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD			\
-} })
+} }
 
 #endif
 
 #define CPU_MASK_NONE							\
-((cpumask_t) { {							\
+(cpumask_t) { {								\
 	[0 ... BITS_TO_LONGS(NR_CPUS)-1] =  0UL				\
-} })
+} }
 
 #define CPU_MASK_CPU0							\
-((cpumask_t) { {							\
+(cpumask_t) { {								\
 	[0] =  1UL							\
-} })
+} }
 
 #define cpus_addr(src) ((src).bits)