netdev - [vhost:vhost 32/52] include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast

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Message-ID: <202008060456.M9GRXltb%lkp@intel.com>
Date:   Thu, 6 Aug 2020 04:17:13 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kbuild-all@...ts.01.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [vhost:vhost 32/52] include/linux/typecheck.h:12:18: warning:
 comparison of distinct pointer types lacks a cast

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost
head:   4c05433bc6fb4ae172270f0279be8ba89a3da64f
commit: b025584098e621d88894d28e80af686958e273af [32/52] virtio_input: convert to LE accessors
config: parisc-randconfig-r003-20200805 (attached as .config)
compiler: hppa-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout b025584098e621d88894d28e80af686958e273af
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/irqflags.h:15,
                    from include/asm-generic/cmpxchg-local.h:6,
                    from arch/parisc/include/asm/cmpxchg.h:89,
                    from arch/parisc/include/asm/atomic.h:10,
                    from include/linux/atomic.h:7,
                    from arch/parisc/include/asm/bitops.h:13,
                    from include/linux/bitops.h:29,
                    from include/linux/kernel.h:12,
                    from include/linux/list.h:9,
                    from include/linux/module.h:12,
                    from drivers/virtio/virtio_input.c:2:
   drivers/virtio/virtio_input.c: In function 'virtinput_probe':
>> include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast
      12 |  (void)(&__dummy == &__dummy2); \
         |                  ^~
   include/linux/virtio_config.h:405:3: note: in expansion of macro 'typecheck'
     405 |   typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \
         |   ^~~~~~~~~
   drivers/virtio/virtio_input.c:247:3: note: in expansion of macro 'virtio_cread_le'
     247 |   virtio_cread_le(vi->vdev, struct virtio_input_config,
         |   ^~~~~~~~~~~~~~~
>> include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast
      12 |  (void)(&__dummy == &__dummy2); \
         |                  ^~
   include/linux/virtio_config.h:405:3: note: in expansion of macro 'typecheck'
     405 |   typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \
         |   ^~~~~~~~~
   drivers/virtio/virtio_input.c:249:3: note: in expansion of macro 'virtio_cread_le'
     249 |   virtio_cread_le(vi->vdev, struct virtio_input_config,
         |   ^~~~~~~~~~~~~~~
>> include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast
      12 |  (void)(&__dummy == &__dummy2); \
         |                  ^~
   include/linux/virtio_config.h:405:3: note: in expansion of macro 'typecheck'
     405 |   typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \
         |   ^~~~~~~~~
   drivers/virtio/virtio_input.c:251:3: note: in expansion of macro 'virtio_cread_le'
     251 |   virtio_cread_le(vi->vdev, struct virtio_input_config,
         |   ^~~~~~~~~~~~~~~
>> include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast
      12 |  (void)(&__dummy == &__dummy2); \
         |                  ^~
   include/linux/virtio_config.h:405:3: note: in expansion of macro 'typecheck'
     405 |   typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \
         |   ^~~~~~~~~
   drivers/virtio/virtio_input.c:253:3: note: in expansion of macro 'virtio_cread_le'
     253 |   virtio_cread_le(vi->vdev, struct virtio_input_config,
         |   ^~~~~~~~~~~~~~~

vim +12 include/linux/typecheck.h

e0deaff470900a4 Andrew Morton 2008-07-25   4  
e0deaff470900a4 Andrew Morton 2008-07-25   5  /*
e0deaff470900a4 Andrew Morton 2008-07-25   6   * Check at compile time that something is of a particular type.
e0deaff470900a4 Andrew Morton 2008-07-25   7   * Always evaluates to 1 so you may use it easily in comparisons.
e0deaff470900a4 Andrew Morton 2008-07-25   8   */
e0deaff470900a4 Andrew Morton 2008-07-25   9  #define typecheck(type,x) \
e0deaff470900a4 Andrew Morton 2008-07-25  10  ({	type __dummy; \
e0deaff470900a4 Andrew Morton 2008-07-25  11  	typeof(x) __dummy2; \
e0deaff470900a4 Andrew Morton 2008-07-25 @12  	(void)(&__dummy == &__dummy2); \
e0deaff470900a4 Andrew Morton 2008-07-25  13  	1; \
e0deaff470900a4 Andrew Morton 2008-07-25  14  })
e0deaff470900a4 Andrew Morton 2008-07-25  15  

:::::: The code at line 12 was first introduced by commit
:::::: e0deaff470900a4c3222ca7139f6c9639e26a2f5 split the typecheck macros out of include/linux/kernel.h

:::::: TO: Andrew Morton <akpm@...ux-foundation.org>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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