Re: [next:akpm 129/309] net/core/sock.c:274:36: error: initializer element is not constant

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On 11-Aug-12, at 10:42 PM, Michael Cree wrote:

On 12/08/12 14:10, Fengguang Wu wrote:
On Sun, Aug 12, 2012 at 01:33:09PM +1200, Michael Cree wrote:
On 03/08/12 03:02, Fengguang Wu wrote:
On Thu, Jul 26, 2012 at 10:06:41AM -0700, Tony Luck wrote:
On Tue, Jul 24, 2012 at 10:10 PM, James Bottomley
<James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote:
Here is the line in sock.i:

struct static_key memalloc_socks = ((struct static_key) { .enabled =
((atomic_t) { (0) }) });

The above line contains two compound literals. It also uses a designated initializer to initialize the field enabled. A compound literal is not a
constant expression.

Seeing the same thing on ia64 building next-20120726. Same fix works
for me ... so I'll steal this whole changelog and attributes.

I got the same error for alpha, the same fix applies.

Just trying this patch on Alpha against v3.6-rc1 and it leads to new
compilation errors, namely:

init/init_task.c:12: error: braced-group within expression allowed only
inside a function
init/init_task.c:13: error: braced-group within expression allowed only
inside a function
init/init_task.c:16: error: braced-group within expression allowed only
inside a function
init/init_task.c:16: error: braced-group within expression allowed only
inside a function
make[1]: *** [init/init_task.o] Error 1

Sorry! This will actually compile:

-#define ATOMIC_INIT(i)         ( { (i) } )
+#define ATOMIC_INIT(i)         { (i) }

Thanks, it now compiles correctly.  I'm currently collecting Alpha
patches to send on to Linus so will include this one.


A similar change applied to 3.5.1 stable compiles successfully
on parisc.

Regards,
Dave
--
John David Anglin	dave.anglin@xxxxxxxx


diff --git a/arch/parisc/include/asm/atomic.h b/arch/parisc/include/asm/atomic.h
index 6c6defc..af9cf30 100644
--- a/arch/parisc/include/asm/atomic.h
+++ b/arch/parisc/include/asm/atomic.h
@@ -141,7 +141,7 @@ static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
 
 #define atomic_sub_and_test(i,v)	(atomic_sub_return((i),(v)) == 0)
 
-#define ATOMIC_INIT(i)	((atomic_t) { (i) })
+#define ATOMIC_INIT(i)	{ (i) }
 
 #define smp_mb__before_atomic_dec()	smp_mb()
 #define smp_mb__after_atomic_dec()	smp_mb()
@@ -150,7 +150,7 @@ static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
 
 #ifdef CONFIG_64BIT
 
-#define ATOMIC64_INIT(i) ((atomic64_t) { (i) })
+#define ATOMIC64_INIT(i) { (i) }
 
 static __inline__ s64
 __atomic64_add_return(s64 i, atomic64_t *v)

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