On Thu, 29 Nov 2007, Martin Schwidefsky wrote:
> On Wed, 2007-11-28 at 13:09 -0800, Christoph Lameter wrote:
> > s390 has a special way to determine the pointer to a per cpu area
> > plus there is a way to access the base of the per cpu area of the
> > currently executing processor.
> >
> > Note: I had to do a minor change to ASM code. Please check that
> > this was done right.
>
> Hi Christoph,
>
> after fixing the trainwreck with Gregs kset changes I've got rc3-mm2
> compiled with your percpu patches. The new s390 percpu code works fine:
>
> Acked-by: Martin Schwidefsky <[email protected]>
Cc: [email protected]
Signed-off-by: Christoph Lameter <[email protected]>
Signed-off-by: Mike Travis <[email protected]>
---
include/asm-s390/percpu.h | 33 +++++++++------------------------
1 file changed, 9 insertions(+), 24 deletions(-)
--- a/include/asm-s390/percpu.h
+++ b/include/asm-s390/percpu.h
@@ -13,40 +13,25 @@
*/
#if defined(__s390x__) && defined(MODULE)
-#define __reloc_hide(var,offset) (*({ \
+#define SHIFT_PTR(ptr,offset) (({ \
extern int simple_identifier_##var(void); \
unsigned long *__ptr; \
- asm ( "larl %0,per_cpu__"#var"@GOTENT" \
- : "=a" (__ptr) : "X" (per_cpu__##var) ); \
- (typeof(&per_cpu__##var))((*__ptr) + (offset)); }))
+ asm ( "larl %0, %1@GOTENT" \
+ : "=a" (__ptr) : "X" (ptr) ); \
+ (typeof(ptr))((*__ptr) + (offset)); }))
#else
-#define __reloc_hide(var, offset) (*({ \
+#define SHIFT_PTR(ptr, offset) (({ \
extern int simple_identifier_##var(void); \
unsigned long __ptr; \
- asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) ); \
- (typeof(&per_cpu__##var)) (__ptr + (offset)); }))
+ asm ( "" : "=a" (__ptr) : "0" (ptr) ); \
+ (typeof(ptr)) (__ptr + (offset)); }))
#endif
-#ifdef CONFIG_SMP
+#define __my_cpu_offset S390_lowcore.percpu_offset
-extern unsigned long __per_cpu_offset[NR_CPUS];
-
-#define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
-#define __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
-#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
-#define per_cpu_offset(x) (__per_cpu_offset[x])
-
-#else /* ! SMP */
-
-#define __get_cpu_var(var) __reloc_hide(var,0)
-#define __raw_get_cpu_var(var) __reloc_hide(var,0)
-#define per_cpu(var,cpu) __reloc_hide(var,0)
-
-#endif /* SMP */
-
-#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
+#include <asm-generic/percpu.h>
#endif /* __ARCH_S390_PERCPU__ */
--
--
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