[tip:WIP.sched/cpusallowed 4/13] arch/ia64/sn/kernel/sn2/sn_hwperf.c:640:26: error: passing argument 2 of 'work_on_cpu_safe' from incompatible pointer type

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/cpusallowed
head:   4ba98c7ec4094a9123d0d6aabb4497290207b518
commit: ca631e2b69f859a8d51855b32dd45a65e78f2bfc [4/13] ia64/sn/hwperf: Use work_on_cpu_safe()
config: ia64-allyesconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout ca631e2b69f859a8d51855b32dd45a65e78f2bfc
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   arch/ia64/sn/kernel/sn2/sn_hwperf.c: In function 'sn_hwperf_op_cpu':
>> arch/ia64/sn/kernel/sn2/sn_hwperf.c:640:26: error: passing argument 2 of 'work_on_cpu_safe' from incompatible pointer type [-Werror=incompatible-pointer-types]
       work_on_cpu_safe(cpu, sn_hwperf_call_sal, op_info);
                             ^~~~~~~~~~~~~~~~~~
   In file included from include/linux/fs.h:31:0,
                    from arch/ia64/sn/kernel/sn2/sn_hwperf.c:26:
   include/linux/workqueue.h:617:6: note: expected 'long int (*)(void *)' but argument is of type 'void (*)(void *)'
    long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg);
         ^~~~~~~~~~~~~~~~
   arch/ia64/sn/kernel/sn2/sn_hwperf.c:612:12: warning: unused variable 'save_allowed' [-Wunused-variable]
     cpumask_t save_allowed;
               ^~~~~~~~~~~~
   At top level:
   arch/ia64/sn/kernel/sn2/sn_hwperf.c:601:13: warning: 'sn_hwperf_call_sal_work' defined but not used [-Wunused-function]
    static long sn_hwperf_call_sal_work(void *info)
                ^~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/work_on_cpu_safe +640 arch/ia64/sn/kernel/sn2/sn_hwperf.c

   634			if (use_ipi) {
   635				/* use an interprocessor interrupt to call SAL */
   636				smp_call_function_single(cpu, sn_hwperf_call_sal,
   637					op_info, 1);
   638			} else {
   639				/* Call on the target CPU */
 > 640				work_on_cpu_safe(cpu, sn_hwperf_call_sal, op_info);
   641			}
   642		}
   643		r = op_info->ret;

---
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