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* [linux-stable-rc:linux-5.5.y 978/1046] include/linux/compiler.h:188:26: warning: 'sb_page' may be used uninitialized in this function
@ 2020-02-25 17:18 kbuild test robot
  2020-02-26  1:55 ` Coly Li
  0 siblings, 1 reply; 2+ messages in thread
From: kbuild test robot @ 2020-02-25 17:18 UTC (permalink / raw)
  To: kbuild-all

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.5.y
head:   d542c06f7665ee93cf6983dac472a1dd12050401
commit: a81d1c887b5c9f37200578e3d7bbb9134b6ef0a1 [978/1046] bcache: rework error unwinding in register_bcache
config: x86_64-randconfig-d001-20200225 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
reproduce:
        git checkout a81d1c887b5c9f37200578e3d7bbb9134b6ef0a1
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/wait.h:7,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from include/linux/highmem.h:5,
                    from include/linux/bio.h:8,
                    from drivers/md/bcache/bcache.h:182,
                    from drivers/md/bcache/super.c:10:
   drivers/md/bcache/super.c: In function 'register_bcache':
   include/linux/printk.h:310:2: warning: 'path' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
     ^~~~~~
   drivers/md/bcache/super.c:2379:8: note: 'path' was declared here
     char *path;
           ^~~~
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/wait.h:7,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from include/linux/highmem.h:5,
                    from include/linux/bio.h:8,
                    from drivers/md/bcache/bcache.h:182,
                    from drivers/md/bcache/super.c:10:
   include/linux/printk.h:310:2: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
     ^~~~~~
   drivers/md/bcache/super.c:2378:14: note: 'err' was declared here
     const char *err;
                 ^~~
   In file included from include/linux/export.h:43:0,
                    from include/linux/linkage.h:7,
                    from include/linux/fs.h:5,
                    from include/linux/highmem.h:5,
                    from include/linux/bio.h:8,
                    from drivers/md/bcache/bcache.h:182,
                    from drivers/md/bcache/super.c:10:
>> include/linux/compiler.h:188:26: warning: 'sb_page' may be used uninitialized in this function [-Wmaybe-uninitialized]
     case 8: *(__u64 *)res = *(volatile __u64 *)p; break;  \
                             ^
   drivers/md/bcache/super.c:2382:15: note: 'sb_page' was declared here
     struct page *sb_page;
                  ^~~~~~~
--
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/wait.h:7,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from include/linux/highmem.h:5,
                    from include/linux/bio.h:8,
                    from drivers/md//bcache/bcache.h:182,
                    from drivers/md//bcache/super.c:10:
   drivers/md//bcache/super.c: In function 'register_bcache':
   include/linux/printk.h:310:2: warning: 'path' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
     ^~~~~~
   drivers/md//bcache/super.c:2379:8: note: 'path' was declared here
     char *path;
           ^~~~
   In file included from include/linux/kernel.h:15:0,
                    from include/linux/list.h:9,
                    from include/linux/wait.h:7,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from include/linux/highmem.h:5,
                    from include/linux/bio.h:8,
                    from drivers/md//bcache/bcache.h:182,
                    from drivers/md//bcache/super.c:10:
   include/linux/printk.h:310:2: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
     ^~~~~~
   drivers/md//bcache/super.c:2378:14: note: 'err' was declared here
     const char *err;
                 ^~~
   In file included from include/linux/export.h:43:0,
                    from include/linux/linkage.h:7,
                    from include/linux/fs.h:5,
                    from include/linux/highmem.h:5,
                    from include/linux/bio.h:8,
                    from drivers/md//bcache/bcache.h:182,
                    from drivers/md//bcache/super.c:10:
>> include/linux/compiler.h:188:26: warning: 'sb_page' may be used uninitialized in this function [-Wmaybe-uninitialized]
     case 8: *(__u64 *)res = *(volatile __u64 *)p; break;  \
                             ^
   drivers/md//bcache/super.c:2382:15: note: 'sb_page' was declared here
     struct page *sb_page;
                  ^~~~~~~

vim +/sb_page +188 include/linux/compiler.h

230fa253df6352 Christian Borntraeger 2014-11-25  181  
d976441f44bc5d Andrey Ryabinin       2015-10-19  182  #define __READ_ONCE_SIZE						\
d976441f44bc5d Andrey Ryabinin       2015-10-19  183  ({									\
d976441f44bc5d Andrey Ryabinin       2015-10-19  184  	switch (size) {							\
d976441f44bc5d Andrey Ryabinin       2015-10-19  185  	case 1: *(__u8 *)res = *(volatile __u8 *)p; break;		\
d976441f44bc5d Andrey Ryabinin       2015-10-19  186  	case 2: *(__u16 *)res = *(volatile __u16 *)p; break;		\
d976441f44bc5d Andrey Ryabinin       2015-10-19  187  	case 4: *(__u32 *)res = *(volatile __u32 *)p; break;		\
d976441f44bc5d Andrey Ryabinin       2015-10-19 @188  	case 8: *(__u64 *)res = *(volatile __u64 *)p; break;		\
d976441f44bc5d Andrey Ryabinin       2015-10-19  189  	default:							\
d976441f44bc5d Andrey Ryabinin       2015-10-19  190  		barrier();						\
d976441f44bc5d Andrey Ryabinin       2015-10-19  191  		__builtin_memcpy((void *)res, (const void *)p, size);	\
d976441f44bc5d Andrey Ryabinin       2015-10-19  192  		barrier();						\
d976441f44bc5d Andrey Ryabinin       2015-10-19  193  	}								\
d976441f44bc5d Andrey Ryabinin       2015-10-19  194  })
d976441f44bc5d Andrey Ryabinin       2015-10-19  195  

:::::: The code at line 188 was first introduced by commit
:::::: d976441f44bc5d48635d081d277aa76556ffbf8b compiler, atomics, kasan: Provide READ_ONCE_NOCHECK()

:::::: TO: Andrey Ryabinin <aryabinin@virtuozzo.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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

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2020-02-25 17:18 [linux-stable-rc:linux-5.5.y 978/1046] include/linux/compiler.h:188:26: warning: 'sb_page' may be used uninitialized in this function kbuild test robot
2020-02-26  1:55 ` Coly Li

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