[openeuler:OLK-5.10 21262/30000] kernel/gcov/gcc_base.c:92:6: warning: no previous prototype for '__gcov_merge_topn' - Kernel

31 Mar 2024


      tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   737efe73dd2ca6ee503ba26e6fc3ee41bd8cf633
commit: 2872514ea26634954ebf05f31ee1691111502df5 [21262/30000] GCC: Add value profile support for kernel.
config: x86_64-randconfig-011-20240331 (https://download.01.org/0day-ci/archive/20240331/202403311107.WlS3rnFu-lkp@i...)
compiler: gcc-10 (Ubuntu 10.5.0-1ubuntu1) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240331/202403311107.WlS3rnFu-lkp@i...)
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/202403311107.WlS3rnFu-lkp@intel.com/
All warnings (new ones prefixed by >>):
drivers/media/dvb-core/dvb_net.c: In function 'dvb_net_add_if':
...
...
drivers/media/dvb-core/dvb_net.c:1362:41: warning: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size between 0 and 11 [-Wformat-truncation=]
1362 |   snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
         |                                         ^~
   drivers/media/dvb-core/dvb_net.c:1362:33: note: directive argument in the range [0, 2147483647]
    1362 |   snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
         |                                 ^~~~~~~~~~~
   drivers/media/dvb-core/dvb_net.c:1362:3: note: 'snprintf' output between 7 and 35 bytes into a destination of size 16
    1362 |   snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
         |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    1363 |     dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
         |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
   kernel/gcov/gcc_base.c:12:6: warning: no previous prototype for '__gcov_init' [-Wmissing-prototypes]
      12 | void __gcov_init(struct gcov_info *info)
         |      ^~~~~~~~~~~
   kernel/gcov/gcc_base.c:40:6: warning: no previous prototype for '__gcov_flush' [-Wmissing-prototypes]
      40 | void __gcov_flush(void)
         |      ^~~~~~~~~~~~
   kernel/gcov/gcc_base.c:46:6: warning: no previous prototype for '__gcov_merge_add' [-Wmissing-prototypes]
      46 | void __gcov_merge_add(gcov_type *counters, unsigned int n_counters)
         |      ^~~~~~~~~~~~~~~~
   kernel/gcov/gcc_base.c:52:6: warning: no previous prototype for '__gcov_merge_single' [-Wmissing-prototypes]
      52 | void __gcov_merge_single(gcov_type *counters, unsigned int n_counters)
         |      ^~~~~~~~~~~~~~~~~~~
   kernel/gcov/gcc_base.c:58:6: warning: no previous prototype for '__gcov_merge_delta' [-Wmissing-prototypes]
      58 | void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
         |      ^~~~~~~~~~~~~~~~~~
   kernel/gcov/gcc_base.c:64:6: warning: no previous prototype for '__gcov_merge_ior' [-Wmissing-prototypes]
      64 | void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters)
         |      ^~~~~~~~~~~~~~~~
   kernel/gcov/gcc_base.c:70:6: warning: no previous prototype for '__gcov_merge_time_profile' [-Wmissing-prototypes]
      70 | void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/gcov/gcc_base.c:76:6: warning: no previous prototype for '__gcov_merge_icall_topn' [-Wmissing-prototypes]
      76 | void __gcov_merge_icall_topn(gcov_type *counters, unsigned int n_counters)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/gcov/gcc_base.c:82:6: warning: no previous prototype for '__gcov_exit' [-Wmissing-prototypes]
      82 | void __gcov_exit(void)
         |      ^~~~~~~~~~~
...
...
kernel/gcov/gcc_base.c:92:6: warning: no previous prototype for '__gcov_merge_topn' [-Wmissing-prototypes]
92 | void __gcov_merge_topn(gcov_type *counters, unsigned int n_counters)
         |      ^~~~~~~~~~~~~~~~~
...
...
kernel/gcov/gcc_base.c:146:6: warning: no previous prototype for '__gcov_topn_values_profiler' [-Wmissing-prototypes]
146 | void __gcov_topn_values_profiler(gcov_type *counters, gcov_type value)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
...
...
kernel/gcov/gcc_base.c:165:6: warning: no previous prototype for '__gcov_indirect_call_profiler_v4' [-Wmissing-prototypes]
165 | void __gcov_indirect_call_profiler_v4(gcov_type value, void *cur_func)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
...
...
kernel/gcov/gcc_base.c:174:6: warning: no previous prototype for '__gcov_average_profiler' [-Wmissing-prototypes]
174 | void __gcov_average_profiler(gcov_type *counters, gcov_type value)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
...
...
kernel/gcov/gcc_base.c:181:6: warning: no previous prototype for '__gcov_ior_profiler' [-Wmissing-prototypes]
181 | void __gcov_ior_profiler(gcov_type *counters, gcov_type value)
         |      ^~~~~~~~~~~~~~~~~~~
...
...
kernel/gcov/gcc_base.c:191:6: warning: no previous prototype for '__gcov_pow2_profiler' [-Wmissing-prototypes]
191 | void __gcov_pow2_profiler(gcov_type *counters, gcov_type value)
         |      ^~~~~~~~~~~~~~~~~~~~
...
...
kernel/gcov/gcc_base.c:206:6: warning: no previous prototype for '__gcov_interval_profiler' [-Wmissing-prototypes]
206 | void __gcov_interval_profiler(gcov_type *counters, gcov_type value,
         |      ^~~~~~~~~~~~~~~~~~~~~~~~
Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for PGP_PRELOAD
   Depends on [n]: CRYPTO [=y] && ASYMMETRIC_KEY_TYPE [=n]
   Selected by [y]:
   - PGP_PRELOAD_PUBLIC_KEYS [=y] && CRYPTO [=y]
vim +/__gcov_merge_topn +92 kernel/gcov/gcc_base.c
69
...
70	void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
71	{
    72		/* Unused. */
    73	}
    74	EXPORT_SYMBOL(__gcov_merge_time_profile);
    75
...
76	void __gcov_merge_icall_topn(gcov_type *counters, unsigned int n_counters)
77	{
    78		/* Unused. */
    79	}
    80	EXPORT_SYMBOL(__gcov_merge_icall_topn);
    81
...
82	void __gcov_exit(void)
83	{
    84		/* Unused. */
    85	}
    86	EXPORT_SYMBOL(__gcov_exit);
    87	
    88	#ifdef CONFIG_PGO_KERNEL
    89	/* Number of top N value histogram. */
    90	#define GCOV_TOPN_VALUES 4
    91
...
92	void __gcov_merge_topn(gcov_type *counters, unsigned int n_counters)
93	{
    94		/* Unused. */
    95	}
    96	EXPORT_SYMBOL(__gcov_merge_topn);
    97	
    98	struct indirect_call_tuple {
    99		void *callee;
   100	
   101		gcov_type *counters;
   102	};
   103	
   104	/* Kernel does not support __thread keyword. */
   105	struct indirect_call_tuple __gcov_indirect_call;
   106	EXPORT_SYMBOL(__gcov_indirect_call);
   107	
   108	gcov_type __gcov_time_profiler_counter;
   109	EXPORT_SYMBOL(__gcov_time_profiler_counter);
   110	
   111	/*
   112	 * Tries to determine N most commons value among its inputs.
   113	 */
   114	static inline void __gcov_topn_values_profiler_body(gcov_type *counters,
   115			gcov_type value)
   116	{
   117		int empty_counter = -1;
   118		unsigned int i;
   119	
   120		counters[0]++;
   121		++counters;
   122	
   123		/* First try to find an existing value. */
   124		for (i = 0; i < GCOV_TOPN_VALUES; i++)
   125			if (value == counters[2 * i]) {
   126				counters[2 * i + 1] += GCOV_TOPN_VALUES;
   127				return;
   128			} else if (counters[2 * i + 1] <= 0)
   129				empty_counter = i;
   130	
   131		/* Find an empty slot for a new value. */
   132		if (empty_counter != -1) {
   133			counters[2 * empty_counter] = value;
   134			counters[2 * empty_counter + 1] = GCOV_TOPN_VALUES;
   135			return;
   136		}
   137	
   138		/*
   139		 * We haven't found an empty slot, then decrement all
   140		 * counter values by one.
   141		 */
   142		for (i = 0; i < GCOV_TOPN_VALUES; i++)
   143			counters[2 * i + 1]--;
   144	}
   145
...
146	void __gcov_topn_values_profiler(gcov_type *counters, gcov_type value)
147	{
   148		__gcov_topn_values_profiler_body(counters, value);
   149	}
   150	EXPORT_SYMBOL(__gcov_topn_values_profiler);
   151	
   152	/*
   153	 * Tries to determine the most common value among its inputs.
   154	 */
   155	static inline void __gcov_indirect_call_profiler_body(gcov_type value,
   156			void *cur_func)
   157	{
   158		/* Removed the C++ virtual tables contents as kernel is written in C. */
   159		if (cur_func == __gcov_indirect_call.callee)
   160			__gcov_topn_values_profiler_body(__gcov_indirect_call.counters, value);
   161	
   162		__gcov_indirect_call.callee = NULL;
   163	}
   164
...
165	void __gcov_indirect_call_profiler_v4(gcov_type value, void *cur_func)
166	{
   167		__gcov_indirect_call_profiler_body(value, cur_func);
   168	}
   169	EXPORT_SYMBOL(__gcov_indirect_call_profiler_v4);
   170	
   171	/*
   172	 * Increase corresponding COUNTER by VALUE.
   173	 */
...
174	void __gcov_average_profiler(gcov_type *counters, gcov_type value)
175	{
   176		counters[0] += value;
   177		counters[1]++;
   178	}
   179	EXPORT_SYMBOL(__gcov_average_profiler);
   180
...
181	void __gcov_ior_profiler(gcov_type *counters, gcov_type value)
182	{
   183		*counters |= value;
   184	}
   185	EXPORT_SYMBOL(__gcov_ior_profiler);
   186	
   187	/*
   188	 * If VALUE is a power of two, COUNTERS[1] is incremented.	Otherwise
   189	 * COUNTERS[0] is incremented.
   190	 */
...
191	void __gcov_pow2_profiler(gcov_type *counters, gcov_type value)
192	{
   193		if (value == 0 || (value & (value - 1)))
   194			counters[0]++;
   195		else
   196			counters[1]++;
   197	}
   198	EXPORT_SYMBOL(__gcov_pow2_profiler);
   199	
   200	/*
   201	 * If VALUE is in interval <START, START + STEPS - 1>, then increases the
   202	 * corresponding counter in COUNTERS.	If the VALUE is above or below
   203	 * the interval, COUNTERS[STEPS] or COUNTERS[STEPS + 1] is increased
   204	 * instead.
   205	 */
...
206	void __gcov_interval_profiler(gcov_type *counters, gcov_type value,
-- 
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