[PATCH 00/02] remove set

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* [PATCH 00/02] remove set_wmb
       [not found]         ` <20060714105841.4490c0e2.akpm@osdl.org>
@ 2006-07-14 20:04           ` Steven Rostedt
  2006-07-14 20:05           ` [PATCH 01/02] remove set_wmb - doc update Steven Rostedt
  2006-07-14 20:05           ` [PATCH 02/02] remove set_wmb - arch removal Steven Rostedt
  2 siblings, 0 replies; 5+ messages in thread
From: Steven Rostedt @ 2006-07-14 20:04 UTC (permalink / raw)
  To: Andrew Morton
  Cc: Linus Torvalds, mingo, linux-kernel, linux-arch, David Howells

set_wmb(var, value) is not used anywhere in the kernel. And it doesn't
do anything special but shorten the typing of:

  var = value;
  wmb();

Which the above is much more readable, and thus set_wmb is just
something to confuse developers even more.

So this patch series removes set_wmb from the kernel.  It's not
currently used in the kernel, and any out-of-kernel branch can easily
replace it.  So there should be no harm in removing it.

The first patch removes it from Documentation/memory-barriers.txt and
the second patch does a sweep through all the architectures to get rid
of it.  All archs do the above code except ia64 and sparc which do a
mb() instead.  But regardless, it's still not used.

-- Steve

^ permalink raw reply	[flat|nested] 5+ messages in thread

* [PATCH 01/02] remove set_wmb - doc update
       [not found]         ` <20060714105841.4490c0e2.akpm@osdl.org>
  2006-07-14 20:04           ` [PATCH 00/02] remove set_wmb Steven Rostedt
@ 2006-07-14 20:05           ` Steven Rostedt
  2006-07-15  2:22             ` Matthew Wilcox
  2006-07-14 20:05           ` [PATCH 02/02] remove set_wmb - arch removal Steven Rostedt
  2 siblings, 1 reply; 5+ messages in thread
From: Steven Rostedt @ 2006-07-14 20:05 UTC (permalink / raw)
  To: Andrew Morton; +Cc: Linus Torvalds, mingo, linux-arch, David Howells, LKML

This patch removes the reference to set_wmb from memory-barriers.txt
since it shouldn't be used.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Index: linux-2.6.18-rc1/Documentation/memory-barriers.txt
===================================================================
--- linux-2.6.18-rc1.orig/Documentation/memory-barriers.txt	2006-07-14 15:33:44.000000000 -0400
+++ linux-2.6.18-rc1/Documentation/memory-barriers.txt	2006-07-14 15:38:05.000000000 -0400
@@ -1015,10 +1015,9 @@ CPU from reordering them.
 There are some more advanced barrier functions:
 
  (*) set_mb(var, value)
- (*) set_wmb(var, value)
 
-     These assign the value to the variable and then insert at least a write
-     barrier after it, depending on the function.  They aren't guaranteed to
+     This assigns the value to the variable and then inserts at least a write
+     barrier after it, depending on the function.  It isn't guaranteed to
      insert anything more than a compiler barrier in a UP compilation.
 
 



^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH 01/02] remove set_wmb - doc update
  2006-07-14 20:05           ` [PATCH 01/02] remove set_wmb - doc update Steven Rostedt
@ 2006-07-15  2:22             ` Matthew Wilcox
  2006-07-15  2:35               ` Steven Rostedt
  0 siblings, 1 reply; 5+ messages in thread
From: Matthew Wilcox @ 2006-07-15  2:22 UTC (permalink / raw)
  To: Steven Rostedt
  Cc: Andrew Morton, Linus Torvalds, mingo, linux-arch, David Howells,
	LKML

On Fri, Jul 14, 2006 at 04:05:01PM -0400, Steven Rostedt wrote:
>  There are some more advanced barrier functions:
>  
>   (*) set_mb(var, value)
> - (*) set_wmb(var, value)
>  
> -     These assign the value to the variable and then insert at least a write
> -     barrier after it, depending on the function.  They aren't guaranteed to
> +     This assigns the value to the variable and then inserts at least a write
> +     barrier after it, depending on the function.  It isn't guaranteed to
>       insert anything more than a compiler barrier in a UP compilation.

"There is one more advanced barrier function"?  ;-)  Or did you want to
remove set_mb()?

Plus, the "depending on the function" bit means "respectively".  So what
you really want as help is something like:

	This assigns the value to the variable and then inserts a
	barrier after the assignment.  It isn't guaranteed to insert
	anything more than a compiler barrier in a UP compilation.

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH 01/02] remove set_wmb - doc update
  2006-07-15  2:22             ` Matthew Wilcox
@ 2006-07-15  2:35               ` Steven Rostedt
  0 siblings, 0 replies; 5+ messages in thread
From: Steven Rostedt @ 2006-07-15  2:35 UTC (permalink / raw)
  To: Matthew Wilcox
  Cc: Andrew Morton, Linus Torvalds, mingo, linux-arch, David Howells,
	LKML

On Fri, 2006-07-14 at 20:22 -0600, Matthew Wilcox wrote:
> On Fri, Jul 14, 2006 at 04:05:01PM -0400, Steven Rostedt wrote:
> >  There are some more advanced barrier functions:
> >  
> >   (*) set_mb(var, value)
> > - (*) set_wmb(var, value)
> >  
> > -     These assign the value to the variable and then insert at least a write
> > -     barrier after it, depending on the function.  They aren't guaranteed to
> > +     This assigns the value to the variable and then inserts at least a write
> > +     barrier after it, depending on the function.  It isn't guaranteed to
> >       insert anything more than a compiler barrier in a UP compilation.
> 
> "There is one more advanced barrier function"?  ;-)  Or did you want to
> remove set_mb()?

Actually below the patch area we still have:

 (*) smp_mb__before_atomic_dec();
 (*) smp_mb__after_atomic_dec();
 (*) smp_mb__before_atomic_inc();
 (*) smp_mb__after_atomic_inc();

So that "There are" references them too :)

> 
> Plus, the "depending on the function" bit means "respectively".  So what
> you really want as help is something like:
> 
> 	This assigns the value to the variable and then inserts a
> 	barrier after the assignment.  It isn't guaranteed to insert
> 	anything more than a compiler barrier in a UP compilation.

OK, you're right here, that "depending on the function" needs to go.
Here's a better version:

Thanks,

-- Steve

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Index: linux-2.6.18-rc1/Documentation/memory-barriers.txt
===================================================================
--- linux-2.6.18-rc1.orig/Documentation/memory-barriers.txt	2006-07-14 15:38:23.000000000 -0400
+++ linux-2.6.18-rc1/Documentation/memory-barriers.txt	2006-07-14 22:31:01.000000000 -0400
@@ -1015,11 +1015,10 @@ CPU from reordering them.
 There are some more advanced barrier functions:
 
  (*) set_mb(var, value)
- (*) set_wmb(var, value)
 
-     These assign the value to the variable and then insert at least a write
-     barrier after it, depending on the function.  They aren't guaranteed to
-     insert anything more than a compiler barrier in a UP compilation.
+     This assigns the value to the variable and then inserts a memory barrier
+     after it.  It isn't guaranteed to insert anything more than a compiler
+     barrier in a UP compilation.
 
 
  (*) smp_mb__before_atomic_dec();



^ permalink raw reply	[flat|nested] 5+ messages in thread

* [PATCH 02/02] remove set_wmb - arch removal
       [not found]         ` <20060714105841.4490c0e2.akpm@osdl.org>
  2006-07-14 20:04           ` [PATCH 00/02] remove set_wmb Steven Rostedt
  2006-07-14 20:05           ` [PATCH 01/02] remove set_wmb - doc update Steven Rostedt
@ 2006-07-14 20:05           ` Steven Rostedt
  2 siblings, 0 replies; 5+ messages in thread
From: Steven Rostedt @ 2006-07-14 20:05 UTC (permalink / raw)
  To: Andrew Morton
  Cc: Linus Torvalds, mingo, linux-kernel, linux-arch, David Howells

set_wmb should not be used in the kernel because it just confuses the
code more and has no benefit.  Since it is not currently used in the
kernel this patch removes it so that new code does not include it.

All archs define set_wmb(var, value) to do { var = value; wmb(); }
while(0) except ia64 and sparc which use a mb() instead.  But this is
still moot since it is not used anyway.

Hasn't been tested on any archs but x86 and x86_64 (and only compiled
tested)

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Index: linux-2.6.18-rc1/include/asm-alpha/barrier.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-alpha/barrier.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-alpha/barrier.h	2006-07-14 15:39:01.000000000 -0400
@@ -30,7 +30,4 @@ __asm__ __volatile__("mb": : :"memory")
 #define set_mb(var, value) \
 do { var = value; mb(); } while (0)
 
-#define set_wmb(var, value) \
-do { var = value; wmb(); } while (0)
-
 #endif		/* __BARRIER_H */
Index: linux-2.6.18-rc1/include/asm-arm/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-arm/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-arm/system.h	2006-07-14 15:39:05.000000000 -0400
@@ -176,7 +176,6 @@ extern unsigned int user_debug;
 #define wmb() mb()
 #define read_barrier_depends() do { } while(0)
 #define set_mb(var, value)  do { var = value; mb(); } while (0)
-#define set_wmb(var, value) do { var = value; wmb(); } while (0)
 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
 
 /*
Index: linux-2.6.18-rc1/include/asm-arm26/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-arm26/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-arm26/system.h	2006-07-14 15:39:13.000000000 -0400
@@ -90,7 +90,6 @@ extern unsigned int user_debug;
 
 #define read_barrier_depends() do { } while(0)
 #define set_mb(var, value)  do { var = value; mb(); } while (0)
-#define set_wmb(var, value) do { var = value; wmb(); } while (0)
 
 /*
  * We assume knowledge of how
Index: linux-2.6.18-rc1/include/asm-cris/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-cris/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-cris/system.h	2006-07-14 15:39:17.000000000 -0400
@@ -17,7 +17,6 @@ extern struct task_struct *resume(struct
 #define wmb() mb()
 #define read_barrier_depends() do { } while(0)
 #define set_mb(var, value)  do { var = value; mb(); } while (0)
-#define set_wmb(var, value) do { var = value; wmb(); } while (0)
 
 #ifdef CONFIG_SMP
 #define smp_mb()        mb()
Index: linux-2.6.18-rc1/include/asm-frv/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-frv/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-frv/system.h	2006-07-14 15:39:20.000000000 -0400
@@ -179,7 +179,6 @@ do {							\
 #define rmb()			asm volatile ("membar" : : :"memory")
 #define wmb()			asm volatile ("membar" : : :"memory")
 #define set_mb(var, value)	do { var = value; mb(); } while (0)
-#define set_wmb(var, value)	do { var = value; wmb(); } while (0)
 
 #define smp_mb()		mb()
 #define smp_rmb()		rmb()
Index: linux-2.6.18-rc1/include/asm-h8300/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-h8300/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-h8300/system.h	2006-07-14 15:39:23.000000000 -0400
@@ -84,7 +84,6 @@ asmlinkage void resume(void);
 #define wmb()  asm volatile (""   : : :"memory")
 #define set_rmb(var, value)    do { xchg(&var, value); } while (0)
 #define set_mb(var, value)     set_rmb(var, value)
-#define set_wmb(var, value)    do { var = value; wmb(); } while (0)
 
 #ifdef CONFIG_SMP
 #define smp_mb()	mb()
Index: linux-2.6.18-rc1/include/asm-i386/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-i386/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-i386/system.h	2006-07-14 15:39:27.000000000 -0400
@@ -454,8 +454,6 @@ static inline unsigned long long __cmpxc
 #define set_mb(var, value) do { var = value; barrier(); } while (0)
 #endif
 
-#define set_wmb(var, value) do { var = value; wmb(); } while (0)
-
 #include <linux/irqflags.h>
 
 /*
Index: linux-2.6.18-rc1/include/asm-ia64/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-ia64/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-ia64/system.h	2006-07-14 15:39:43.000000000 -0400
@@ -98,12 +98,11 @@ extern struct ia64_boot_param {
 #endif
 
 /*
- * XXX check on these---I suspect what Linus really wants here is
+ * XXX check on this ---I suspect what Linus really wants here is
  * acquire vs release semantics but we can't discuss this stuff with
  * Linus just yet.  Grrr...
  */
 #define set_mb(var, value)	do { (var) = (value); mb(); } while (0)
-#define set_wmb(var, value)	do { (var) = (value); mb(); } while (0)
 
 #define safe_halt()         ia64_pal_halt_light()    /* PAL_HALT_LIGHT */
 
Index: linux-2.6.18-rc1/include/asm-m32r/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-m32r/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-m32r/system.h	2006-07-14 15:39:47.000000000 -0400
@@ -336,7 +336,6 @@ __cmpxchg(volatile void *ptr, unsigned l
 #endif
 
 #define set_mb(var, value) do { xchg(&var, value); } while (0)
-#define set_wmb(var, value) do { var = value; wmb(); } while (0)
 
 #define arch_align_stack(x) (x)
 
Index: linux-2.6.18-rc1/include/asm-m68k/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-m68k/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-m68k/system.h	2006-07-14 15:39:52.000000000 -0400
@@ -80,7 +80,6 @@ static inline int irqs_disabled(void)
 #define wmb()		barrier()
 #define read_barrier_depends()	do { } while(0)
 #define set_mb(var, value)    do { xchg(&var, value); } while (0)
-#define set_wmb(var, value)    do { var = value; wmb(); } while (0)
 
 #define smp_mb()	barrier()
 #define smp_rmb()	barrier()
Index: linux-2.6.18-rc1/include/asm-m68knommu/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-m68knommu/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-m68knommu/system.h	2006-07-14 15:39:55.000000000 -0400
@@ -106,7 +106,6 @@ asmlinkage void resume(void);
 #define wmb()  asm volatile (""   : : :"memory")
 #define set_rmb(var, value)    do { xchg(&var, value); } while (0)
 #define set_mb(var, value)     set_rmb(var, value)
-#define set_wmb(var, value)    do { var = value; wmb(); } while (0)
 
 #ifdef CONFIG_SMP
 #define smp_mb()	mb()
Index: linux-2.6.18-rc1/include/asm-mips/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-mips/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-mips/system.h	2006-07-14 15:39:59.000000000 -0400
@@ -143,9 +143,6 @@
 #define set_mb(var, value) \
 do { var = value; mb(); } while (0)
 
-#define set_wmb(var, value) \
-do { var = value; wmb(); } while (0)
-
 /*
  * switch_to(n) should switch tasks to task nr n, first
  * checking that n isn't the current task, in which case it does nothing.
Index: linux-2.6.18-rc1/include/asm-parisc/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-parisc/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-parisc/system.h	2006-07-14 15:40:03.000000000 -0400
@@ -143,8 +143,6 @@ static inline void set_eiem(unsigned lon
 #define read_barrier_depends()		do { } while(0)
 
 #define set_mb(var, value)		do { var = value; mb(); } while (0)
-#define set_wmb(var, value)		do { var = value; wmb(); } while (0)
-
 
 #ifndef CONFIG_PA20
 /* Because kmalloc only guarantees 8-byte alignment for kmalloc'd data,
Index: linux-2.6.18-rc1/include/asm-powerpc/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-powerpc/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-powerpc/system.h	2006-07-14 15:40:07.000000000 -0400
@@ -39,7 +39,6 @@
 #define read_barrier_depends()  do { } while(0)
 
 #define set_mb(var, value)	do { var = value; mb(); } while (0)
-#define set_wmb(var, value)	do { var = value; wmb(); } while (0)
 
 #ifdef __KERNEL__
 #ifdef CONFIG_SMP
Index: linux-2.6.18-rc1/include/asm-ppc/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-ppc/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-ppc/system.h	2006-07-14 15:40:11.000000000 -0400
@@ -33,7 +33,6 @@
 #define read_barrier_depends()  do { } while(0)
 
 #define set_mb(var, value)	do { var = value; mb(); } while (0)
-#define set_wmb(var, value)	do { var = value; wmb(); } while (0)
 
 #ifdef CONFIG_SMP
 #define smp_mb()	mb()
Index: linux-2.6.18-rc1/include/asm-s390/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-s390/system.h	2006-07-14 15:38:49.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-s390/system.h	2006-07-14 15:40:15.000000000 -0400
@@ -299,7 +299,6 @@ __cmpxchg(volatile void *ptr, unsigned l
 
 
 #define set_mb(var, value)      do { var = value; mb(); } while (0)
-#define set_wmb(var, value)     do { var = value; wmb(); } while (0)
 
 #ifdef __s390x__
 
Index: linux-2.6.18-rc1/include/asm-sh/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-sh/system.h	2006-07-14 15:38:50.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-sh/system.h	2006-07-14 15:40:18.000000000 -0400
@@ -101,7 +101,6 @@ extern void __xchg_called_with_bad_point
 #endif
 
 #define set_mb(var, value) do { xchg(&var, value); } while (0)
-#define set_wmb(var, value) do { var = value; wmb(); } while (0)
 
 /* Interrupt Control */
 static __inline__ void local_irq_enable(void)
Index: linux-2.6.18-rc1/include/asm-sh64/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-sh64/system.h	2006-07-14 15:38:50.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-sh64/system.h	2006-07-14 15:40:21.000000000 -0400
@@ -66,7 +66,6 @@ extern void __xchg_called_with_bad_point
 
 #define set_rmb(var, value) do { xchg(&var, value); } while (0)
 #define set_mb(var, value) set_rmb(var, value)
-#define set_wmb(var, value) do { var = value; wmb(); } while (0)
 
 /* Interrupt Control */
 #ifndef HARD_CLI
Index: linux-2.6.18-rc1/include/asm-sparc/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-sparc/system.h	2006-07-14 15:38:50.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-sparc/system.h	2006-07-14 15:40:30.000000000 -0400
@@ -199,7 +199,6 @@ static inline unsigned long getipl(void)
 #define wmb()	mb()
 #define read_barrier_depends()	do { } while(0)
 #define set_mb(__var, __value)  do { __var = __value; mb(); } while(0)
-#define set_wmb(__var, __value) set_mb(__var, __value)
 #define smp_mb()	__asm__ __volatile__("":::"memory")
 #define smp_rmb()	__asm__ __volatile__("":::"memory")
 #define smp_wmb()	__asm__ __volatile__("":::"memory")
Index: linux-2.6.18-rc1/include/asm-sparc64/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-sparc64/system.h	2006-07-14 15:38:50.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-sparc64/system.h	2006-07-14 15:40:35.000000000 -0400
@@ -123,8 +123,6 @@ do {	__asm__ __volatile__("ba,pt	%%xcc, 
 #define read_barrier_depends()		do { } while(0)
 #define set_mb(__var, __value) \
 	do { __var = __value; membar_storeload_storestore(); } while(0)
-#define set_wmb(__var, __value) \
-	do { __var = __value; wmb(); } while(0)
 
 #ifdef CONFIG_SMP
 #define smp_mb()	mb()
Index: linux-2.6.18-rc1/include/asm-v850/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-v850/system.h	2006-07-14 15:38:50.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-v850/system.h	2006-07-14 15:40:39.000000000 -0400
@@ -68,7 +68,6 @@ static inline int irqs_disabled (void)
 #define read_barrier_depends()	((void)0)
 #define set_rmb(var, value)	do { xchg (&var, value); } while (0)
 #define set_mb(var, value)	set_rmb (var, value)
-#define set_wmb(var, value)	do { var = value; wmb (); } while (0)
 
 #define smp_mb()	mb ()
 #define smp_rmb()	rmb ()
Index: linux-2.6.18-rc1/include/asm-x86_64/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-x86_64/system.h	2006-07-14 15:38:50.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-x86_64/system.h	2006-07-14 15:40:42.000000000 -0400
@@ -240,7 +240,6 @@ static inline unsigned long __cmpxchg(vo
 #endif
 #define read_barrier_depends()	do {} while(0)
 #define set_mb(var, value) do { (void) xchg(&var, value); } while (0)
-#define set_wmb(var, value) do { var = value; wmb(); } while (0)
 
 #define warn_if_not_ulong(x) do { unsigned long foo; (void) (&(x) == &foo); } while (0)
 
Index: linux-2.6.18-rc1/include/asm-xtensa/system.h
===================================================================
--- linux-2.6.18-rc1.orig/include/asm-xtensa/system.h	2006-07-14 15:38:50.000000000 -0400
+++ linux-2.6.18-rc1/include/asm-xtensa/system.h	2006-07-14 15:40:44.000000000 -0400
@@ -99,7 +99,6 @@ static inline void disable_coprocessor(i
 #endif
 
 #define set_mb(var, value)	do { var = value; mb(); } while (0)
-#define set_wmb(var, value)	do { var = value; wmb(); } while (0)
 
 #if !defined (__ASSEMBLY__)
 



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