v4.19.13 snapshot.
diff --git a/arch/ia64/include/asm/futex.h b/arch/ia64/include/asm/futex.h
new file mode 100644
index 0000000..db2dd85
--- /dev/null
+++ b/arch/ia64/include/asm/futex.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_FUTEX_H
+#define _ASM_FUTEX_H
+
+#include <linux/futex.h>
+#include <linux/uaccess.h>
+#include <asm/errno.h>
+
+#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
+do { \
+ register unsigned long r8 __asm ("r8") = 0; \
+ __asm__ __volatile__( \
+ " mf;; \n" \
+ "[1:] " insn ";; \n" \
+ " .xdata4 \"__ex_table\", 1b-., 2f-. \n" \
+ "[2:]" \
+ : "+r" (r8), "=r" (oldval) \
+ : "r" (uaddr), "r" (oparg) \
+ : "memory"); \
+ ret = r8; \
+} while (0)
+
+#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
+do { \
+ register unsigned long r8 __asm ("r8") = 0; \
+ int val, newval; \
+ do { \
+ __asm__ __volatile__( \
+ " mf;; \n" \
+ "[1:] ld4 %3=[%4];; \n" \
+ " mov %2=%3 \n" \
+ insn ";; \n" \
+ " mov ar.ccv=%2;; \n" \
+ "[2:] cmpxchg4.acq %1=[%4],%3,ar.ccv;; \n" \
+ " .xdata4 \"__ex_table\", 1b-., 3f-.\n" \
+ " .xdata4 \"__ex_table\", 2b-., 3f-.\n" \
+ "[3:]" \
+ : "+r" (r8), "=r" (val), "=&r" (oldval), \
+ "=&r" (newval) \
+ : "r" (uaddr), "r" (oparg) \
+ : "memory"); \
+ if (unlikely (r8)) \
+ break; \
+ } while (unlikely (val != oldval)); \
+ ret = r8; \
+} while (0)
+
+static inline int
+arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
+{
+ int oldval = 0, ret;
+
+ pagefault_disable();
+
+ switch (op) {
+ case FUTEX_OP_SET:
+ __futex_atomic_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr,
+ oparg);
+ break;
+ case FUTEX_OP_ADD:
+ __futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg);
+ break;
+ case FUTEX_OP_OR:
+ __futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg);
+ break;
+ case FUTEX_OP_ANDN:
+ __futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr,
+ ~oparg);
+ break;
+ case FUTEX_OP_XOR:
+ __futex_atomic_op2("xor %3=%3,%5", ret, oldval, uaddr, oparg);
+ break;
+ default:
+ ret = -ENOSYS;
+ }
+
+ pagefault_enable();
+
+ if (!ret)
+ *oval = oldval;
+
+ return ret;
+}
+
+static inline int
+futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
+ u32 oldval, u32 newval)
+{
+ if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+ return -EFAULT;
+
+ {
+ register unsigned long r8 __asm ("r8") = 0;
+ unsigned long prev;
+ __asm__ __volatile__(
+ " mf;; \n"
+ " mov ar.ccv=%4;; \n"
+ "[1:] cmpxchg4.acq %1=[%2],%3,ar.ccv \n"
+ " .xdata4 \"__ex_table\", 1b-., 2f-. \n"
+ "[2:]"
+ : "+r" (r8), "=&r" (prev)
+ : "r" (uaddr), "r" (newval),
+ "rO" ((long) (unsigned) oldval)
+ : "memory");
+ *uval = prev;
+ return r8;
+ }
+}
+
+#endif /* _ASM_FUTEX_H */