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| author | David Vrabel <david.vrabel@citrix.com> | 2014-04-28 10:31:04 +0100 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2014-04-28 10:31:04 +0100 |
| commit | 67dadcb324c2fe059cb2c35f8b80df42bb23f7c4 (patch) | |
| tree | 3521a2a9e05a7de426ab50bc7685489ad6340e54 /arch/arm/include/asm/futex.h | |
| parent | eb47f71200b7d5b4c8c1f8c75675f592d855aafd (diff) | |
| parent | e26a9e00afc482b971afcaef1db8c9034d4d6d7c (diff) | |
| download | linux-67dadcb324c2fe059cb2c35f8b80df42bb23f7c4.tar.bz2 | |
Merge commit 'e26a9e0' into stable/for-linus-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 e42cf597f6e6..53e69dae796f 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 */ |