diff options
| author | Paul Moore <pmoore@redhat.com> | 2014-06-17 17:30:23 -0400 |
|---|---|---|
| committer | Paul Moore <pmoore@redhat.com> | 2014-06-17 17:30:23 -0400 |
| commit | 170b5910d9fbea79de1bb40df22eda5f98250c0c (patch) | |
| tree | ca9560e878d2842d45c6f99077d0d8b8f8b0f9ba /arch/arm/include/asm/futex.h | |
| parent | 47dd0b76ace953bd2c0479076db0d3e3b9594003 (diff) | |
| parent | 1860e379875dfe7271c649058aeddffe5afd9d0d (diff) | |
Merge tag 'v3.15' into next
Linux 3.15
Diffstat (limited to 'arch/arm/include/asm/futex.h')
| -rw-r--r-- | arch/arm/include/asm/futex.h | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/arch/arm/include/asm/futex.h b/arch/arm/include/asm/futex.h index e42cf597f6e..53e69dae796 100644 --- a/arch/arm/include/asm/futex.h +++ b/arch/arm/include/asm/futex.h @@ -3,11 +3,6 @@ #ifdef __KERNEL__ -#if defined(CONFIG_CPU_USE_DOMAINS) && defined(CONFIG_SMP) -/* ARM doesn't provide unprivileged exclusive memory accessors */ -#include <asm-generic/futex.h> -#else - #include <linux/futex.h> #include <linux/uaccess.h> #include <asm/errno.h> @@ -28,6 +23,7 @@ #define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg) \ smp_mb(); \ + prefetchw(uaddr); \ __asm__ __volatile__( \ "1: ldrex %1, [%3]\n" \ " " insn "\n" \ @@ -51,6 +47,8 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, return -EFAULT; smp_mb(); + /* Prefetching cannot fault */ + prefetchw(uaddr); __asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n" "1: ldrex %1, [%4]\n" " teq %1, %2\n" @@ -164,6 +162,5 @@ futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) return ret; } -#endif /* !(CPU_USE_DOMAINS && SMP) */ #endif /* __KERNEL__ */ #endif /* _ASM_ARM_FUTEX_H */ |