linux-kernel - [PATCH v2] futex: generic arch_futex_atomic_op

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Date:   Tue, 16 Jul 2019 09:22:03 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     Thomas Gleixner <tglx@...utronix.de>, linux-arch@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH v2] futex: generic arch_futex_atomic_op_inuser() cleanup

generic smp version of arch_futex_atomic_op_inuser() always returns -ENOSYS

Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
 include/asm-generic/futex.h | 21 +--------------------
 1 file changed, 1 insertion(+), 20 deletions(-)

diff --git a/include/asm-generic/futex.h b/include/asm-generic/futex.h
index 8666fe7f35d7..02970b11f71f 100644
--- a/include/asm-generic/futex.h
+++ b/include/asm-generic/futex.h
@@ -118,26 +118,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 static inline int
 arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval, u32 __user *uaddr)
 {
-	int oldval = 0, ret;
-
-	pagefault_disable();
-
-	switch (op) {
-	case FUTEX_OP_SET:
-	case FUTEX_OP_ADD:
-	case FUTEX_OP_OR:
-	case FUTEX_OP_ANDN:
-	case FUTEX_OP_XOR:
-	default:
-		ret = -ENOSYS;
-	}
-
-	pagefault_enable();
-
-	if (!ret)
-		*oval = oldval;
-
-	return ret;
+	return -ENOSYS;
 }
 
 static inline int
-- 
2.17.1