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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