Re: [PATCH v17 2/6] ring-buffer: Introducing ring-buffer mapping functions

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

Hi Vincent,

kernel test robot noticed the following build errors:

[auto build test ERROR on ca185770db914869ff9fe773bac5e0e5e4165b83]

url:    https://github.com/intel-lab-lkp/linux/commits/Vincent-Donnefort/ring-buffer-Zero-ring-buffer-sub-buffers/20240213-195302
base:   ca185770db914869ff9fe773bac5e0e5e4165b83
patch link:    https://lore.kernel.org/r/20240213114945.3528801-3-vdonnefort%40google.com
patch subject: [PATCH v17 2/6] ring-buffer: Introducing ring-buffer mapping functions
config: i386-buildonly-randconfig-001-20240214 (https://download.01.org/0day-ci/archive/20240214/202402140910.TFs9k0YR-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240214/202402140910.TFs9k0YR-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/202402140910.TFs9k0YR-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/trace/ring_buffer.c:6185:2: error: member reference type 'struct mutex' is not a pointer; did you mean to use '.'?
    6185 |         lockdep_assert_held(cpu_buffer->mapping_lock);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/lockdep.h:267:17: note: expanded from macro 'lockdep_assert_held'
     267 |         lockdep_assert(lockdep_is_held(l) != LOCK_STATE_NOT_HELD)
         |         ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/lockdep.h:234:52: note: expanded from macro 'lockdep_is_held'
     234 | #define lockdep_is_held(lock)           lock_is_held(&(lock)->dep_map)
         |                                                             ^
   include/linux/lockdep.h:261:32: note: expanded from macro 'lockdep_assert'
     261 |         do { WARN_ON(debug_locks && !(cond)); } while (0)
         |              ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
   include/asm-generic/bug.h:123:25: note: expanded from macro 'WARN_ON'
     123 |         int __ret_warn_on = !!(condition);                              \
         |                                ^~~~~~~~~
>> kernel/trace/ring_buffer.c:6185:2: error: cannot take the address of an rvalue of type 'struct lockdep_map'
    6185 |         lockdep_assert_held(cpu_buffer->mapping_lock);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/lockdep.h:267:17: note: expanded from macro 'lockdep_assert_held'
     267 |         lockdep_assert(lockdep_is_held(l) != LOCK_STATE_NOT_HELD)
         |         ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/lockdep.h:234:45: note: expanded from macro 'lockdep_is_held'
     234 | #define lockdep_is_held(lock)           lock_is_held(&(lock)->dep_map)
         |                                                      ^
   include/linux/lockdep.h:261:32: note: expanded from macro 'lockdep_assert'
     261 |         do { WARN_ON(debug_locks && !(cond)); } while (0)
         |              ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
   include/asm-generic/bug.h:123:25: note: expanded from macro 'WARN_ON'
     123 |         int __ret_warn_on = !!(condition);                              \
         |                                ^~~~~~~~~
   2 errors generated.


vim +6185 kernel/trace/ring_buffer.c

  6174	
  6175	/*
  6176	 * Fast-path for rb_buffer_(un)map(). Called whenever the meta-page doesn't need
  6177	 * to be set-up or torn-down.
  6178	 */
  6179	static int __rb_inc_dec_mapped(struct trace_buffer *buffer,
  6180				       struct ring_buffer_per_cpu *cpu_buffer,
  6181				       bool inc)
  6182	{
  6183		unsigned long flags;
  6184	
> 6185		lockdep_assert_held(cpu_buffer->mapping_lock);
  6186	
  6187		if (inc && cpu_buffer->mapped == UINT_MAX)
  6188			return -EBUSY;
  6189	
  6190		if (WARN_ON(!inc && cpu_buffer->mapped == 0))
  6191			return -EINVAL;
  6192	
  6193		mutex_lock(&buffer->mutex);
  6194		raw_spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
  6195	
  6196		if (inc)
  6197			cpu_buffer->mapped++;
  6198		else
  6199			cpu_buffer->mapped--;
  6200	
  6201		raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
  6202		mutex_unlock(&buffer->mutex);
  6203	
  6204		return 0;
  6205	}
  6206	

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