[linux-nvme:nvme-5.9-rc 14/14] include/uapi/linux/swab.h:120:2: warning: 'buflen' is used uninitialized in this function

[kernel test robot]

tree:   git://git.infradead.org/nvme.git nvme-5.9-rc
head:   cd83b396e350d2f13bd2ad81565255f77a13aa3a
commit: cd83b396e350d2f13bd2ad81565255f77a13aa3a [14/14] nvme: fix error handling in nvme_ns_report_zones
config: sparc-allyesconfig (attached as .config)
compiler: sparc64-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 cd83b396e350d2f13bd2ad81565255f77a13aa3a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc 

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/swab.h:5,
                    from include/uapi/linux/byteorder/big_endian.h:13,
                    from include/linux/byteorder/big_endian.h:5,
                    from arch/sparc/include/uapi/asm/byteorder.h:5,
                    from arch/sparc/include/asm/bitops_64.h:16,
                    from arch/sparc/include/asm/bitops.h:5,
                    from include/linux/bitops.h:29,
                    from include/linux/kernel.h:12,
                    from include/asm-generic/bug.h:20,
                    from arch/sparc/include/asm/bug.h:25,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:12,
                    from arch/sparc/include/asm/current.h:15,
                    from include/linux/sched.h:12,
                    from include/linux/blkdev.h:5,
                    from drivers/nvme/host/zns.c:6:
   drivers/nvme/host/zns.c: In function 'nvme_ns_report_zones':
>> include/uapi/linux/swab.h:120:2: warning: 'buflen' is used uninitialized in this function [-Wuninitialized]
     120 |  __fswab32(x))
         |  ^~~~~~~~~

git remote add linux-nvme git://git.infradead.org/nvme.git
git fetch --no-tags linux-nvme nvme-5.9-rc
git checkout cd83b396e350d2f13bd2ad81565255f77a13aa3a
vim +/buflen +120 include/uapi/linux/swab.h

607ca46e97a1b6 David Howells 2012-10-13  109  
607ca46e97a1b6 David Howells 2012-10-13  110  /**
607ca46e97a1b6 David Howells 2012-10-13  111   * __swab32 - return a byteswapped 32-bit value
607ca46e97a1b6 David Howells 2012-10-13  112   * @x: value to byteswap
607ca46e97a1b6 David Howells 2012-10-13  113   */
7322dd755e7dd3 Arnd Bergmann 2016-05-05  114  #ifdef __HAVE_BUILTIN_BSWAP32__
7322dd755e7dd3 Arnd Bergmann 2016-05-05  115  #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
7322dd755e7dd3 Arnd Bergmann 2016-05-05  116  #else
607ca46e97a1b6 David Howells 2012-10-13  117  #define __swab32(x)				\
607ca46e97a1b6 David Howells 2012-10-13  118  	(__builtin_constant_p((__u32)(x)) ?	\
607ca46e97a1b6 David Howells 2012-10-13  119  	___constant_swab32(x) :			\
607ca46e97a1b6 David Howells 2012-10-13 @120  	__fswab32(x))
7322dd755e7dd3 Arnd Bergmann 2016-05-05  121  #endif
607ca46e97a1b6 David Howells 2012-10-13  122  

:::::: The code at line 120 was first introduced by commit
:::::: 607ca46e97a1b6594b29647d98a32d545c24bdff UAPI: (Scripted) Disintegrate include/linux

:::::: TO: David Howells <dhowells at redhat.com>
:::::: CC: David Howells <dhowells at redhat.com>

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