Re: [RFC PATCH 4/5] ceph: Add BLOG debugfs support

[kernel test robot <lkp@intel.com>]

Hi Alex,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-nonmm-unstable]
[also build test ERROR on tip/sched/core linus/master v6.18-rc2 next-20251024]
[cannot apply to ceph-client/testing ceph-client/for-linus]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Alex-Markuze/sched-fork-Wire-BLOG-contexts-into-task-lifecycle/20251024-164832
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
patch link:    https://lore.kernel.org/r/20251024084259.2359693-5-amarkuze%40redhat.com
patch subject: [RFC PATCH 4/5] ceph: Add BLOG debugfs support
config: i386-buildonly-randconfig-005-20251025 (https://download.01.org/0day-ci/archive/20251025/202510251449.dXsrM1va-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251025/202510251449.dXsrM1va-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510251449.dXsrM1va-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from fs/ceph/debugfs.c:23:
   In file included from include/linux/ceph/ceph_blog.h:10:
   In file included from include/linux/blog/blog.h:17:
>> include/linux/blog/blog_ser.h:120:16: error: static assertion failed due to requirement 'sizeof (null_str.str) == sizeof(unsigned long)': null_str.str size must match unsigned long for proper alignment
     120 |         static_assert(sizeof(null_str.str) == sizeof(unsigned long),
         |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:77:50: note: expanded from macro 'static_assert'
      77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                                  ^~~~
   include/linux/build_bug.h:78:56: note: expanded from macro '__static_assert'
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                                        ^~~~
   include/linux/blog/blog_ser.h:120:37: note: expression evaluates to '8 == 4'
     120 |         static_assert(sizeof(null_str.str) == sizeof(unsigned long),
         |                       ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:77:50: note: expanded from macro 'static_assert'
      77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                                  ^~~~
   include/linux/build_bug.h:78:56: note: expanded from macro '__static_assert'
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                                        ^~~~
   fs/ceph/debugfs.c:407:2: error: call to undeclared function 'boutc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     407 |         boutc(fsc->client, "begin\n");
         |         ^
   fs/ceph/debugfs.c:429:2: error: call to undeclared function 'boutc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     429 |         boutc(fsc->client, "begin\n");
         |         ^
   3 errors generated.
--
   In file included from debugfs.c:23:
   In file included from include/linux/ceph/ceph_blog.h:10:
   In file included from include/linux/blog/blog.h:17:
>> include/linux/blog/blog_ser.h:120:16: error: static assertion failed due to requirement 'sizeof (null_str.str) == sizeof(unsigned long)': null_str.str size must match unsigned long for proper alignment
     120 |         static_assert(sizeof(null_str.str) == sizeof(unsigned long),
         |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:77:50: note: expanded from macro 'static_assert'
      77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                                  ^~~~
   include/linux/build_bug.h:78:56: note: expanded from macro '__static_assert'
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                                        ^~~~
   include/linux/blog/blog_ser.h:120:37: note: expression evaluates to '8 == 4'
     120 |         static_assert(sizeof(null_str.str) == sizeof(unsigned long),
         |                       ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:77:50: note: expanded from macro 'static_assert'
      77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                                  ^~~~
   include/linux/build_bug.h:78:56: note: expanded from macro '__static_assert'
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                                        ^~~~
   debugfs.c:407:2: error: call to undeclared function 'boutc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     407 |         boutc(fsc->client, "begin\n");
         |         ^
   debugfs.c:429:2: error: call to undeclared function 'boutc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     429 |         boutc(fsc->client, "begin\n");
         |         ^
   3 errors generated.


vim +120 include/linux/blog/blog_ser.h

8ffa1efe9718cb Alex Markuze 2025-10-24  116  
8ffa1efe9718cb Alex Markuze 2025-10-24  117  static inline size_t write_null_str(char *dst)
8ffa1efe9718cb Alex Markuze 2025-10-24  118  {
8ffa1efe9718cb Alex Markuze 2025-10-24  119  	*(union null_str_u *)dst = null_str;
8ffa1efe9718cb Alex Markuze 2025-10-24 @120  	static_assert(sizeof(null_str.str) == sizeof(unsigned long),
8ffa1efe9718cb Alex Markuze 2025-10-24  121  		     "null_str.str size must match unsigned long for proper alignment");
8ffa1efe9718cb Alex Markuze 2025-10-24  122  	return __builtin_strlen(null_str.str);
8ffa1efe9718cb Alex Markuze 2025-10-24  123  }
8ffa1efe9718cb Alex Markuze 2025-10-24  124  

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