1 files changed, 11 insertions, 35 deletions

diff --git a/arch/alpha/include/asm/futex.h b/arch/alpha/include/asm/futex.h
index f939794363ac..da67afd578fd 100644
--- a/arch/alpha/include/asm/futex.h
+++ b/arch/alpha/include/asm/futex.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _ASM_ALPHA_FUTEX_H
 #define _ASM_ALPHA_FUTEX_H
 
@@ -19,31 +20,20 @@
 	"3:	.subsection 2\n"				\
 	"4:	br	1b\n"					\
 	"	.previous\n"					\
-	"	.section __ex_table,\"a\"\n"			\
-	"	.long	1b-.\n"					\
-	"	lda	$31,3b-1b(%1)\n"			\
-	"	.long	2b-.\n"					\
-	"	lda	$31,3b-2b(%1)\n"			\
-	"	.previous\n"					\
+	EXC(1b,3b,$31,%1)					\
+	EXC(2b,3b,$31,%1)					\
 	:	"=&r" (oldval), "=&r"(ret)			\
 	:	"r" (uaddr), "r"(oparg)				\
 	:	"memory")
 
-static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
+static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
+		u32 __user *uaddr)
 {
-	int op = (encoded_op >> 28) & 7;
-	int cmp = (encoded_op >> 24) & 15;
-	int oparg = (encoded_op << 8) >> 20;
-	int cmparg = (encoded_op << 20) >> 20;
 	int oldval = 0, ret;
-	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
-		oparg = 1 << oparg;
 
-	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+	if (!access_ok(uaddr, sizeof(u32)))
 		return -EFAULT;
 
-	pagefault_disable();
-
 	switch (op) {
 	case FUTEX_OP_SET:
 		__futex_atomic_op("mov %3,%1\n", ret, oldval, uaddr, oparg);
@@ -64,19 +54,9 @@ static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
 		ret = -ENOSYS;
 	}
 
-	pagefault_enable();
+	if (!ret)
+		*oval = oldval;
 
-	if (!ret) {
-		switch (cmp) {
-		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
-		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
-		case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
-		case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
-		case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
-		case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
-		default: ret = -ENOSYS;
-		}
-	}
 	return ret;
 }
 
@@ -87,7 +67,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 	int ret = 0, cmp;
 	u32 prev;
 
-	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+	if (!access_ok(uaddr, sizeof(u32)))
 		return -EFAULT;
 
 	__asm__ __volatile__ (
@@ -101,12 +81,8 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 	"3:	.subsection 2\n"
 	"4:	br	1b\n"
 	"	.previous\n"
-	"	.section __ex_table,\"a\"\n"
-	"	.long	1b-.\n"
-	"	lda	$31,3b-1b(%0)\n"
-	"	.long	2b-.\n"
-	"	lda	$31,3b-2b(%0)\n"
-	"	.previous\n"
+	EXC(1b,3b,$31,%0)
+	EXC(2b,3b,$31,%0)
 	:	"+r"(ret), "=&r"(prev), "=&r"(cmp)
 	:	"r"(uaddr), "r"((long)(int)oldval), "r"(newval)
 	:	"memory");