diff options
Diffstat (limited to 'arch/s390/include')
-rw-r--r-- | arch/s390/include/asm/percpu.h | 32 |
1 files changed, 8 insertions, 24 deletions
diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h index 408d60b4f75b..f7ad8719d02d 100644 --- a/arch/s390/include/asm/percpu.h +++ b/arch/s390/include/asm/percpu.h | |||
@@ -1,37 +1,21 @@ | |||
1 | #ifndef __ARCH_S390_PERCPU__ | 1 | #ifndef __ARCH_S390_PERCPU__ |
2 | #define __ARCH_S390_PERCPU__ | 2 | #define __ARCH_S390_PERCPU__ |
3 | 3 | ||
4 | #include <linux/compiler.h> | ||
5 | #include <asm/lowcore.h> | ||
6 | |||
7 | /* | 4 | /* |
8 | * s390 uses its own implementation for per cpu data, the offset of | 5 | * s390 uses its own implementation for per cpu data, the offset of |
9 | * the cpu local data area is cached in the cpu's lowcore memory. | 6 | * the cpu local data area is cached in the cpu's lowcore memory. |
10 | * For 64 bit module code s390 forces the use of a GOT slot for the | ||
11 | * address of the per cpu variable. This is needed because the module | ||
12 | * may be more than 4G above the per cpu area. | ||
13 | */ | 7 | */ |
14 | #if defined(__s390x__) && defined(MODULE) | 8 | #define __my_cpu_offset S390_lowcore.percpu_offset |
15 | |||
16 | #define SHIFT_PERCPU_PTR(ptr,offset) (({ \ | ||
17 | extern int simple_identifier_##var(void); \ | ||
18 | unsigned long *__ptr; \ | ||
19 | asm ( "larl %0, %1@GOTENT" \ | ||
20 | : "=a" (__ptr) : "X" (ptr) ); \ | ||
21 | (typeof(ptr))((*__ptr) + (offset)); })) | ||
22 | |||
23 | #else | ||
24 | |||
25 | #define SHIFT_PERCPU_PTR(ptr, offset) (({ \ | ||
26 | extern int simple_identifier_##var(void); \ | ||
27 | unsigned long __ptr; \ | ||
28 | asm ( "" : "=a" (__ptr) : "0" (ptr) ); \ | ||
29 | (typeof(ptr)) (__ptr + (offset)); })) | ||
30 | 9 | ||
10 | /* | ||
11 | * For 64 bit module code, the module may be more than 4G above the | ||
12 | * per cpu area, use weak definitions to force the compiler to | ||
13 | * generate external references. | ||
14 | */ | ||
15 | #if defined(CONFIG_SMP) && defined(__s390x__) && defined(MODULE) | ||
16 | #define ARCH_NEEDS_WEAK_PER_CPU | ||
31 | #endif | 17 | #endif |
32 | 18 | ||
33 | #define __my_cpu_offset S390_lowcore.percpu_offset | ||
34 | |||
35 | #include <asm-generic/percpu.h> | 19 | #include <asm-generic/percpu.h> |
36 | 20 | ||
37 | #endif /* __ARCH_S390_PERCPU__ */ | 21 | #endif /* __ARCH_S390_PERCPU__ */ |