[PATCH] powerpc/futex: Use masked user access

[Christophe Leroy (CS GROUP)]

Commit 861574d51bbd ("powerpc/uaccess: Implement masked user access")
provides optimised user access by avoiding the cost of access_ok().

Use masked user access in arch_futex_atomic_op_inuser()

Signed-off-by: Christophe Leroy (CS GROUP) <chleroy at kernel.org>
---
 arch/powerpc/include/asm/futex.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/futex.h b/arch/powerpc/include/asm/futex.h
index b3001f8b2c1e..8cf3b2e97e17 100644
--- a/arch/powerpc/include/asm/futex.h
+++ b/arch/powerpc/include/asm/futex.h
@@ -33,8 +33,7 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
 {
 	int oldval = 0, ret;
 
-	if (!user_access_begin(uaddr, sizeof(u32)))
-		return -EFAULT;
+	uaddr = masked_user_access_begin(uaddr);
 
 	switch (op) {
 	case FUTEX_OP_SET:
@@ -69,8 +68,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 	int ret = 0;
 	u32 prev;
 
-	if (!user_access_begin(uaddr, sizeof(u32)))
-		return -EFAULT;
+	uaddr = masked_user_access_begin(uaddr);
 
         __asm__ __volatile__ (
         PPC_ATOMIC_ENTRY_BARRIER
-- 
2.49.0