Messages in this thread | | | Date | Tue, 27 Jul 2021 10:39:35 +0800 | From | kernel test robot <> | Subject | [gustavoars-linux:for-next/clang-fallthrough 4/4] arch/mips/kernel/idle.c:206:3: warning: fallthrough annotation in unreachable code |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git for-next/clang-fallthrough head: 6a8c3492420661bf905f0f1f4cddde0ec8bde6d8 commit: 6a8c3492420661bf905f0f1f4cddde0ec8bde6d8 [4/4] Revert "Revert "Makefile: Enable -Wimplicit-fallthrough for Clang"" config: mips-randconfig-r036-20210726 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project c658b472f3e61e1818e1909bf02f3d65470018a5) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=6a8c3492420661bf905f0f1f4cddde0ec8bde6d8 git remote add gustavoars-linux https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git git fetch --no-tags gustavoars-linux for-next/clang-fallthrough git checkout 6a8c3492420661bf905f0f1f4cddde0ec8bde6d8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> arch/mips/kernel/idle.c:206:3: warning: fallthrough annotation in unreachable code [-Wimplicit-fallthrough] fallthrough; ^ include/linux/compiler_attributes.h:210:41: note: expanded from macro 'fallthrough' # define fallthrough __attribute__((__fallthrough__)) ^ 1 warning generated.
vim +206 arch/mips/kernel/idle.c
49f2ec91e14ce9 Ralf Baechle 2013-05-21 125 49f2ec91e14ce9 Ralf Baechle 2013-05-21 126 void __init check_wait(void) 49f2ec91e14ce9 Ralf Baechle 2013-05-21 127 { 49f2ec91e14ce9 Ralf Baechle 2013-05-21 128 struct cpuinfo_mips *c = ¤t_cpu_data; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 129 49f2ec91e14ce9 Ralf Baechle 2013-05-21 130 if (nowait) { 49f2ec91e14ce9 Ralf Baechle 2013-05-21 131 printk("Wait instruction disabled.\n"); 49f2ec91e14ce9 Ralf Baechle 2013-05-21 132 return; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 133 } 49f2ec91e14ce9 Ralf Baechle 2013-05-21 134 5b10a0e84b4ebe Paul Burton 2015-09-22 135 /* 5b10a0e84b4ebe Paul Burton 2015-09-22 136 * MIPSr6 specifies that masked interrupts should unblock an executing 5b10a0e84b4ebe Paul Burton 2015-09-22 137 * wait instruction, and thus that it is safe for us to use 5b10a0e84b4ebe Paul Burton 2015-09-22 138 * r4k_wait_irqoff. Yippee! 5b10a0e84b4ebe Paul Burton 2015-09-22 139 */ 5b10a0e84b4ebe Paul Burton 2015-09-22 140 if (cpu_has_mips_r6) { 5b10a0e84b4ebe Paul Burton 2015-09-22 141 cpu_wait = r4k_wait_irqoff; 5b10a0e84b4ebe Paul Burton 2015-09-22 142 return; 5b10a0e84b4ebe Paul Burton 2015-09-22 143 } 5b10a0e84b4ebe Paul Burton 2015-09-22 144 69f24d1784b631 Ralf Baechle 2013-09-17 145 switch (current_cpu_type()) { 49f2ec91e14ce9 Ralf Baechle 2013-05-21 146 case CPU_R3081: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 147 case CPU_R3081E: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 148 cpu_wait = r3081_wait; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 149 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 150 case CPU_TX3927: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 151 cpu_wait = r39xx_wait; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 152 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 153 case CPU_R4200: 65ce6197ed403b Lauri Kasanen 2021-01-13 154 /* case CPU_R4300: */ 49f2ec91e14ce9 Ralf Baechle 2013-05-21 155 case CPU_R4600: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 156 case CPU_R4640: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 157 case CPU_R4650: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 158 case CPU_R4700: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 159 case CPU_R5000: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 160 case CPU_R5500: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 161 case CPU_NEVADA: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 162 case CPU_4KC: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 163 case CPU_4KEC: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 164 case CPU_4KSC: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 165 case CPU_5KC: bf463f2f751077 Aurelien Jarno 2015-09-05 166 case CPU_5KE: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 167 case CPU_25KF: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 168 case CPU_PR4450: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 169 case CPU_BMIPS3300: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 170 case CPU_BMIPS4350: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 171 case CPU_BMIPS4380: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 172 case CPU_CAVIUM_OCTEON: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 173 case CPU_CAVIUM_OCTEON_PLUS: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 174 case CPU_CAVIUM_OCTEON2: 4122af0ab02a4b David Daney 2013-07-29 175 case CPU_CAVIUM_OCTEON3: 3b25b763116482 Paul Cercueil 2019-05-08 176 case CPU_XBURST: b2afb64cccd243 Huacai Chen 2019-11-04 177 case CPU_LOONGSON32: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 178 case CPU_XLR: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 179 case CPU_XLP: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 180 cpu_wait = r4k_wait; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 181 break; 268a2d60013049 Jiaxun Yang 2019-10-20 182 case CPU_LOONGSON64: 7507445b199308 Huacai Chen 2019-09-21 183 if ((c->processor_id & (PRID_IMP_MASK | PRID_REV_MASK)) >= 0cf2ea1121aa14 Jiaxun Yang 2020-04-22 184 (PRID_IMP_LOONGSON_64C | PRID_REV_LOONGSON3A_R2_0) || 0cf2ea1121aa14 Jiaxun Yang 2020-04-22 185 (c->processor_id & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R) b2edcfc814017e Huacai Chen 2016-03-03 186 cpu_wait = r4k_wait; b2edcfc814017e Huacai Chen 2016-03-03 187 break; b2edcfc814017e Huacai Chen 2016-03-03 188 adaa0b6c497955 Petri Gynther 2015-10-19 189 case CPU_BMIPS5000: adaa0b6c497955 Petri Gynther 2015-10-19 190 cpu_wait = r4k_wait_irqoff; adaa0b6c497955 Petri Gynther 2015-10-19 191 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 192 case CPU_RM7000: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 193 cpu_wait = rm7k_wait_irqoff; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 194 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 195 e38df288a9db56 James Hogan 2015-01-29 196 case CPU_PROAPTIV: e38df288a9db56 James Hogan 2015-01-29 197 case CPU_P5600: e38df288a9db56 James Hogan 2015-01-29 198 /* e38df288a9db56 James Hogan 2015-01-29 199 * Incoming Fast Debug Channel (FDC) data during a wait e38df288a9db56 James Hogan 2015-01-29 200 * instruction causes the wait never to resume, even if an e38df288a9db56 James Hogan 2015-01-29 201 * interrupt is received. Avoid using wait at all if FDC data is e38df288a9db56 James Hogan 2015-01-29 202 * likely to be received. e38df288a9db56 James Hogan 2015-01-29 203 */ e38df288a9db56 James Hogan 2015-01-29 204 if (IS_ENABLED(CONFIG_MIPS_EJTAG_FDC_TTY)) e38df288a9db56 James Hogan 2015-01-29 205 break; c9b0299034665d Liangliang Huang 2020-05-04 @206 fallthrough; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 207 case CPU_M14KC: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 208 case CPU_M14KEC: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 209 case CPU_24K: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 210 case CPU_34K: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 211 case CPU_1004K: 442e14a2c55e55 Steven J. Hill 2014-01-17 212 case CPU_1074K: 26ab96dfa9f98d Leonid Yegoshin 2013-11-27 213 case CPU_INTERAPTIV: f36c4720fca325 Leonid Yegoshin 2014-03-04 214 case CPU_M5150: 4695089f03929c Leonid Yegoshin 2014-11-24 215 case CPU_QEMU_GENERIC: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 216 cpu_wait = r4k_wait; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 217 if (read_c0_config7() & MIPS_CONF7_WII) 49f2ec91e14ce9 Ralf Baechle 2013-05-21 218 cpu_wait = r4k_wait_irqoff; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 219 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 220 49f2ec91e14ce9 Ralf Baechle 2013-05-21 221 case CPU_74K: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 222 cpu_wait = r4k_wait; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 223 if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0)) 49f2ec91e14ce9 Ralf Baechle 2013-05-21 224 cpu_wait = r4k_wait_irqoff; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 225 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 226 49f2ec91e14ce9 Ralf Baechle 2013-05-21 227 case CPU_TX49XX: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 228 cpu_wait = r4k_wait_irqoff; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 229 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 230 case CPU_ALCHEMY: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 231 cpu_wait = au1k_wait; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 232 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 233 case CPU_20KC: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 234 /* 49f2ec91e14ce9 Ralf Baechle 2013-05-21 235 * WAIT on Rev1.0 has E1, E2, E3 and E16. 49f2ec91e14ce9 Ralf Baechle 2013-05-21 236 * WAIT on Rev2.0 and Rev3.0 has E16. 49f2ec91e14ce9 Ralf Baechle 2013-05-21 237 * Rev3.1 WAIT is nop, why bother 49f2ec91e14ce9 Ralf Baechle 2013-05-21 238 */ 49f2ec91e14ce9 Ralf Baechle 2013-05-21 239 if ((c->processor_id & 0xff) <= 0x64) 49f2ec91e14ce9 Ralf Baechle 2013-05-21 240 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 241 49f2ec91e14ce9 Ralf Baechle 2013-05-21 242 /* 49f2ec91e14ce9 Ralf Baechle 2013-05-21 243 * Another rev is incremeting c0_count at a reduced clock 49f2ec91e14ce9 Ralf Baechle 2013-05-21 244 * rate while in WAIT mode. So we basically have the choice 49f2ec91e14ce9 Ralf Baechle 2013-05-21 245 * between using the cp0 timer as clocksource or avoiding 49f2ec91e14ce9 Ralf Baechle 2013-05-21 246 * the WAIT instruction. Until more details are known, 49f2ec91e14ce9 Ralf Baechle 2013-05-21 247 * disable the use of WAIT for 20Kc entirely. 49f2ec91e14ce9 Ralf Baechle 2013-05-21 248 cpu_wait = r4k_wait; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 249 */ 49f2ec91e14ce9 Ralf Baechle 2013-05-21 250 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 251 default: 49f2ec91e14ce9 Ralf Baechle 2013-05-21 252 break; 49f2ec91e14ce9 Ralf Baechle 2013-05-21 253 } 49f2ec91e14ce9 Ralf Baechle 2013-05-21 254 } 49f2ec91e14ce9 Ralf Baechle 2013-05-21 255
:::::: The code at line 206 was first introduced by commit :::::: c9b0299034665d594e56ee343f28033d1b24de6d MIPS: Use fallthrough for arch/mips
:::::: TO: Liangliang Huang <huanglllzu@gmail.com> :::::: CC: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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