diff options
Diffstat (limited to 'arch/arc/include/asm/processor.h')
| -rw-r--r-- | arch/arc/include/asm/processor.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h index b7b155610067..5f26b2c1cba0 100644 --- a/arch/arc/include/asm/processor.h +++ b/arch/arc/include/asm/processor.h @@ -58,7 +58,15 @@ unsigned long thread_saved_pc(struct task_struct *t); /* Prepare to copy thread state - unlazy all lazy status */ #define prepare_to_copy(tsk) do { } while (0) +/* + * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise + * get optimised away by gcc + */ +#ifdef CONFIG_SMP +#define cpu_relax() __asm__ __volatile__ ("" : : : "memory") +#else #define cpu_relax() do { } while (0) +#endif #define copy_segments(tsk, mm) do { } while (0) #define release_segments(mm) do { } while (0) |