diff mbox

[ALPHA] Redefine ATOMIC_INIT and ATOMIC64_INIT to drop the casts

Message ID 20120812021405.GB8442@localhost (mailing list archive)
State Not Applicable
Headers show

Commit Message

Fengguang Wu Aug. 12, 2012, 2:14 a.m. UTC 
From: Mel Gorman <mgorman@suse.de>

The following build error occurred during an alpha build:

net/core/sock.c:274:36: error: initializer element is not constant

Dave Anglin says:
> 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.

The location of the above statement isn't fully clear, but if a compound
literal occurs outside the body of a function, the initializer list must
consist of constant expressions.

Cc: <stable@vger.kernel.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 arch/alpha/include/asm/atomic.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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Comments

Andrew Morton Aug. 15, 2012, 10:03 p.m. UTC | #1 
On Sun, 12 Aug 2012 10:14:05 +0800
Fengguang Wu <fengguang.wu@intel.com> wrote:

> From: Mel Gorman <mgorman@suse.de>
> 
> The following build error occurred during an alpha build:
> 
> net/core/sock.c:274:36: error: initializer element is not constant
> 
> Dave Anglin says:
> > 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.
> 
> The location of the above statement isn't fully clear, but if a compound
> literal occurs outside the body of a function, the initializer list must
> consist of constant expressions.
> 
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Mel Gorman <mgorman@suse.de>
> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>

I'll remvoe the Cc:stable from this one - the regression is post-3.5.
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diff mbox

Patch

--- linux.orig/arch/alpha/include/asm/atomic.h	2012-08-12 10:12:36.667523339 +0800
+++ linux/arch/alpha/include/asm/atomic.h	2012-08-12 10:12:37.659523362 +0800
@@ -14,8 +14,8 @@ 
  */
 
 
-#define ATOMIC_INIT(i)		( (atomic_t) { (i) } )
-#define ATOMIC64_INIT(i)	( (atomic64_t) { (i) } )
+#define ATOMIC_INIT(i)		{ (i) }
+#define ATOMIC64_INIT(i)	{ (i) }
 
 #define atomic_read(v)		(*(volatile int *)&(v)->counter)
 #define atomic64_read(v)	(*(volatile long *)&(v)->counter)