diff options
Diffstat (limited to 'arch/powerpc/include/asm/barrier.h')
| -rw-r--r-- | arch/powerpc/include/asm/barrier.h | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h index 0eca6efc0631..e7cb72cdb2ba 100644 --- a/arch/powerpc/include/asm/barrier.h +++ b/arch/powerpc/include/asm/barrier.h @@ -36,7 +36,8 @@ #define smp_store_mb(var, value) do { WRITE_ONCE(var, value); mb(); } while (0) -#ifdef __SUBARCH_HAS_LWSYNC +/* The sub-arch has lwsync */ +#if defined(__powerpc64__) || defined(CONFIG_PPC_E500MC) # define SMPWMB LWSYNC #else # define SMPWMB eieio @@ -91,4 +92,25 @@ do { \ #define smp_mb__after_atomic() smp_mb() #define smp_mb__before_spinlock() smp_mb() +#ifdef CONFIG_PPC_BOOK3S_64 +#define NOSPEC_BARRIER_SLOT nop +#elif defined(CONFIG_PPC_FSL_BOOK3E) +#define NOSPEC_BARRIER_SLOT nop; nop +#endif + +#ifdef CONFIG_PPC_BARRIER_NOSPEC +/* + * Prevent execution of subsequent instructions until preceding branches have + * been fully resolved and are no longer executing speculatively. + */ +#define barrier_nospec_asm NOSPEC_BARRIER_FIXUP_SECTION; NOSPEC_BARRIER_SLOT + +// This also acts as a compiler barrier due to the memory clobber. +#define barrier_nospec() asm (stringify_in_c(barrier_nospec_asm) ::: "memory") + +#else /* !CONFIG_PPC_BARRIER_NOSPEC */ +#define barrier_nospec_asm +#define barrier_nospec() +#endif /* CONFIG_PPC_BARRIER_NOSPEC */ + #endif /* _ASM_POWERPC_BARRIER_H */ |