Re: [PATCH v2 1/2] Provide READ_ONCE_NOCHECK()

[kbuild test robot]

Hi Andrey,

[auto build test WARNING on tip/auto-latest -- if it's inappropriate base, please suggest rules for selecting the more suitable base]

url:    https://github.com/0day-ci/linux/commits/Andrey-Ryabinin/Provide-READ_ONCE_NOCHECK/20151013-204127
config: mn10300-allyesconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=mn10300 

All warnings (new ones prefixed by >>):

   fs/nfs/filelayout/filelayout.c: In function 'filelayout_read_pagelist':
   fs/nfs/filelayout/filelayout.c:476:2: warning: format '%Zu' expects argument of type 'size_t', but argument 5 has type '__u32' [-Wformat=]
     dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
     ^
   In file included from include/linux/nfs_fs.h:28:0,
                    from fs/nfs/filelayout/filelayout.c:32:
   fs/nfs/filelayout/filelayout.c: In function 'filelayout_write_pagelist':
   include/linux/compiler.h:270:8: warning: format '%Zu' expects argument of type 'size_t', but argument 5 has type '__u32' [-Wformat=]
     union { typeof(x) __val; char __c[1]; } __u;  \
           ^
   include/linux/sunrpc/debug.h:33:24: note: in definition of macro 'dfprintk'
       printk(KERN_DEFAULT args); \
                           ^
>> include/linux/compiler.h:274:22: note: in expansion of macro '__READ_ONCE'
    #define READ_ONCE(x) __READ_ONCE(x, _check)
                         ^
   include/asm-generic/atomic.h:130:24: note: in expansion of macro 'READ_ONCE'
    #define atomic_read(v) READ_ONCE((v)->counter)
                           ^
   include/linux/sunrpc/debug.h:23:48: note: in expansion of macro 'atomic_read'
    #define dprintk(args...) dfprintk(FACILITY, ## args)
                                                   ^
   fs/nfs/filelayout/filelayout.c:534:2: note: in expansion of macro 'dprintk'
     dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
     ^

vim +/__READ_ONCE +274 include/linux/compiler.h

   264	 * with an explicit memory barrier or atomic instruction that provides the
   265	 * required ordering.
   266	 */
   267	
   268	#define __READ_ONCE(x, check)					\
   269	({								\
 > 270		union { typeof(x) __val; char __c[1]; } __u;		\
   271		__read_once_size##check(&(x), __u.__c, sizeof(x));	\
   272		__u.__val;						\
   273	})
 > 274	#define READ_ONCE(x) __READ_ONCE(x, _check)
   275	#define READ_ONCE_NOCHECK(x) __READ_ONCE(x, _nocheck)
   276	
   277	#define WRITE_ONCE(x, val) \

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