arm64: Use the generic compat_sys_sendfile() implementation

The generic implementation of compat_sys_sendfile() has been introduced
by commit 8f9c0119. This patch removes the arm64 implementation in
favour of the generic one.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/unistd32.h

@@ -752,3 +752,4 @@ __SYSCALL(__NR_syncfs, sys_syncfs)
 #define __ARCH_WANT_SYS_SIGPENDING
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_COMPAT_SYS_SENDFILE

arch/arm64/kernel/sys_compat.c

@@ -84,26 +84,6 @@ asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,
 	return ret;
 }
 
-asmlinkage int compat_sys_sendfile(int out_fd, int in_fd,
-				   compat_off_t __user *offset, s32 count)
-{
-	mm_segment_t old_fs = get_fs();
-	int ret;
-	off_t of;
-
-	if (offset && get_user(of, offset))
-		return -EFAULT;
-
-	set_fs(KERNEL_DS);
-	ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
-			   count);
-	set_fs(old_fs);
-
-	if (offset && put_user(of, offset))
-		return -EFAULT;
-	return ret;
-}
-
 static inline void
 do_compat_cache_op(unsigned long start, unsigned long end, int flags)
 {