diff options
| -rw-r--r-- | arch/s390/include/asm/percpu.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h index 5899f57f17d1..b18a96f3a334 100644 --- a/arch/s390/include/asm/percpu.h +++ b/arch/s390/include/asm/percpu.h @@ -12,6 +12,24 @@ */ #define __my_cpu_offset get_lowcore()->percpu_offset +#define arch_raw_cpu_ptr(_ptr) \ +({ \ + unsigned long lc_percpu, tcp_ptr__; \ + \ + tcp_ptr__ = (__force unsigned long)(_ptr); \ + lc_percpu = offsetof(struct lowcore, percpu_offset); \ + asm_inline volatile( \ + ALTERNATIVE("ag %[__ptr__],%[offzero](%%r0)\n", \ + "ag %[__ptr__],%[offalt](%%r0)\n", \ + ALT_FEATURE(MFEATURE_LOWCORE)) \ + : [__ptr__] "+d" (tcp_ptr__) \ + : [offzero] "i" (lc_percpu), \ + [offalt] "i" (lc_percpu + LOWCORE_ALT_ADDRESS), \ + "m" (((struct lowcore *)0)->percpu_offset) \ + : "cc"); \ + (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)tcp_ptr__; \ +}) + /* * We use a compare-and-swap loop since that uses less cpu cycles than * disabling and enabling interrupts like the generic variant would do. |