See https://lkml.org/lkml/2014/10/29/643 and commit 
f56141e3e2d9
("all arches, signal: move restart_block to struct task_struct")
Signed-off-by: Ley Foon Tan <lftan@altera.com>
                                                  0-0x7FFFFFFF for user-thead
                                                  0-0xFFFFFFFF for kernel-thread
                                                */
-       struct restart_block    restart_block;
        struct pt_regs          *regs;
 };
 
        .cpu            = 0,                    \
        .preempt_count  = INIT_PREEMPT_COUNT,   \
        .addr_limit     = KERNEL_DS,            \
-       .restart_block  = {                     \
-               .fn = do_no_restart_syscall,    \
-       },                                      \
 }
 
 #define init_thread_info       (init_thread_union.thread_info)
 
        int err;
 
        /* Always make any pending restarted system calls return -EINTR */
-       current_thread_info()->restart_block.fn = do_no_restart_syscall;
+       current->restart_block.fn = do_no_restart_syscall;
 
        err = __get_user(temp, &uc->uc_mcontext.version);
        if (temp != MCONTEXT_VERSION)