[S390] fix futex_atomic_cmpxchg_inatomic



futex_atomic_cmpxchg_inatomic has the same bug as the other
atomic futex operations: the operation needs to be done in the
user address space, not the kernel address space. Add the missing
sacf 256 & sacf 0.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent 6ab4879a

include/asm-s390/futex.h

+3 −2

Original line number	Diff line number	Diff line
		@@ -98,9 +98,10 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)

		if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
		return -EFAULT;
		asm volatile(" cs %1,%4,0(%5)\n"
		asm volatile(" sacf 256\n"
		" cs %1,%4,0(%5)\n"
		"0: lr %0,%1\n"
		"1:\n"
		"1: sacf 0\n"
		#ifndef __s390x__
		".section __ex_table,\"a\"\n"
		" .align 4\n"