linux-kernel - [tip:WIP.sched/cpusallowed 13/13] drivers/crypto/n2_core.c:1659:31: error: passing argument 2 of 'work_on_cpu

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Date:   Thu, 13 Apr 2017 12:26:03 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.sched/cpusallowed 13/13] drivers/crypto/n2_core.c:1659:31:
 error: passing argument 2 of 'work_on_cpu_safe' from incompatible pointer
 type

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/cpusallowed
head:   4ba98c7ec4094a9123d0d6aabb4497290207b518
commit: 4ba98c7ec4094a9123d0d6aabb4497290207b518 [13/13] crypto: n2 - Use work_on_cpu() instead of affinity games
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 4ba98c7ec4094a9123d0d6aabb4497290207b518
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All error/warnings (new ones prefixed by >>):

   drivers/crypto/n2_core.c: In function 'spu_queue_register':
>> drivers/crypto/n2_core.c:1659:31: error: passing argument 2 of 'work_on_cpu_safe' from incompatible pointer type [-Werror=incompatible-pointer-types]
     return work_on_cpu_safe(cpu, &qr);
                                  ^
   In file included from include/linux/srcu.h:34:0,
                    from include/linux/notifier.h:15,
                    from include/linux/memory_hotplug.h:6,
                    from include/linux/mmzone.h:749,
                    from include/linux/gfp.h:5,
                    from include/linux/kmod.h:22,
                    from include/linux/module.h:13,
                    from drivers/crypto/n2_core.c:9:
   include/linux/workqueue.h:617:6: note: expected 'long int (*)(void *)' but argument is of type 'struct spu_qreg *'
    long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg);
         ^~~~~~~~~~~~~~~~
>> drivers/crypto/n2_core.c:1659:9: error: too few arguments to function 'work_on_cpu_safe'
     return work_on_cpu_safe(cpu, &qr);
            ^~~~~~~~~~~~~~~~
   In file included from include/linux/srcu.h:34:0,
                    from include/linux/notifier.h:15,
                    from include/linux/memory_hotplug.h:6,
                    from include/linux/mmzone.h:749,
                    from include/linux/gfp.h:5,
                    from include/linux/kmod.h:22,
                    from include/linux/module.h:13,
                    from drivers/crypto/n2_core.c:9:
   include/linux/workqueue.h:617:6: note: declared here
    long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg);
         ^~~~~~~~~~~~~~~~
>> drivers/crypto/n2_core.c:1660:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
   At top level:
   drivers/crypto/n2_core.c:1639:13: warning: 'spu_queue_register_workfn' defined but not used [-Wunused-function]
    static long spu_queue_register_workfn(void *arg)
                ^~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/work_on_cpu_safe +1659 drivers/crypto/n2_core.c

  1653	
  1654	static int spu_queue_register(struct spu_queue *p, unsigned long q_type)
  1655	{
  1656		int cpu = cpumask_any_and(&p->sharing, cpu_online_mask);
  1657		struct spu_qreg qr = { .queue = p, .type = q_type };
  1658	
> 1659		return work_on_cpu_safe(cpu, &qr);
> 1660	}
  1661	
  1662	static int spu_queue_setup(struct spu_queue *p)
  1663	{

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