Hi Alexandre, I love your patch! Yet something to improve: [auto build test ERROR on abelloni/rtc-next] [also build test ERROR on v4.17-rc6 next-20180517] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Alexandre-Belloni/rtc-st-lpc-fix-possible-race-condition/20180521-192317 base: https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next config: arm-multi_v7_defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=arm All error/warnings (new ones prefixed by >>): drivers/rtc/rtc-st-lpc.c: In function 'st_rtc_probe': >> drivers/rtc/rtc-st-lpc.c:261:5: error: 'struct st_rtc' has no member named 'range_max' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~ In file included from arch/arm/include/asm/div64.h:127:0, from include/linux/kernel.h:173, from include/linux/clk.h:16, from drivers/rtc/rtc-st-lpc.c:17: >> include/asm-generic/div64.h:226:7: error: lvalue required as left operand of assignment (n) >>= ilog2(__base); \ ^ >> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ >> include/asm-generic/div64.h:230:31: warning: large integer implicitly truncated to unsigned type [-Woverflow] uint32_t __res_lo, __n_lo = (n); \ ^ >> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ include/asm-generic/div64.h:231:7: error: lvalue required as left operand of assignment (n) = __div64_const32(n, __base); \ ^ >> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ include/asm-generic/div64.h:233:14: warning: large integer implicitly truncated to unsigned type [-Woverflow] __res_lo = (n); \ ^ >> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ include/asm-generic/div64.h:237:7: error: lvalue required as left operand of assignment (n) = (uint32_t)(n) / __base; \ ^ >> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ >> include/asm-generic/div64.h:239:22: error: lvalue required as unary '&' operand __rem = __div64_32(&(n), __base); \ ^ >> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ -- drivers//rtc/rtc-st-lpc.c: In function 'st_rtc_probe': drivers//rtc/rtc-st-lpc.c:261:5: error: 'struct st_rtc' has no member named 'range_max' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~ In file included from arch/arm/include/asm/div64.h:127:0, from include/linux/kernel.h:173, from include/linux/clk.h:16, from drivers//rtc/rtc-st-lpc.c:17: >> include/asm-generic/div64.h:226:7: error: lvalue required as left operand of assignment (n) >>= ilog2(__base); \ ^ drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ >> include/asm-generic/div64.h:230:31: warning: large integer implicitly truncated to unsigned type [-Woverflow] uint32_t __res_lo, __n_lo = (n); \ ^ drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ include/asm-generic/div64.h:231:7: error: lvalue required as left operand of assignment (n) = __div64_const32(n, __base); \ ^ drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ include/asm-generic/div64.h:233:14: warning: large integer implicitly truncated to unsigned type [-Woverflow] __res_lo = (n); \ ^ drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ include/asm-generic/div64.h:237:7: error: lvalue required as left operand of assignment (n) = (uint32_t)(n) / __base; \ ^ drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ >> include/asm-generic/div64.h:239:22: error: lvalue required as unary '&' operand __rem = __div64_32(&(n), __base); \ ^ drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div' rtc->range_max = do_div(U64_MAX, rtc->clkrate); ^~~~~~ vim +261 drivers/rtc/rtc-st-lpc.c 192 193 static int st_rtc_probe(struct platform_device *pdev) 194 { 195 struct device_node *np = pdev->dev.of_node; 196 struct st_rtc *rtc; 197 struct resource *res; 198 uint32_t mode; 199 int ret = 0; 200 201 ret = of_property_read_u32(np, "st,lpc-mode", &mode); 202 if (ret) { 203 dev_err(&pdev->dev, "An LPC mode must be provided\n"); 204 return -EINVAL; 205 } 206 207 /* LPC can either run as a Clocksource or in RTC or WDT mode */ 208 if (mode != ST_LPC_MODE_RTC) 209 return -ENODEV; 210 211 rtc = devm_kzalloc(&pdev->dev, sizeof(struct st_rtc), GFP_KERNEL); 212 if (!rtc) 213 return -ENOMEM; 214 215 rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev); 216 if (IS_ERR(rtc->rtc_dev)) 217 return PTR_ERR(rtc->rtc_dev); 218 219 spin_lock_init(&rtc->lock); 220 221 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 222 rtc->ioaddr = devm_ioremap_resource(&pdev->dev, res); 223 if (IS_ERR(rtc->ioaddr)) 224 return PTR_ERR(rtc->ioaddr); 225 226 rtc->irq = irq_of_parse_and_map(np, 0); 227 if (!rtc->irq) { 228 dev_err(&pdev->dev, "IRQ missing or invalid\n"); 229 return -EINVAL; 230 } 231 232 ret = devm_request_irq(&pdev->dev, rtc->irq, st_rtc_handler, 0, 233 pdev->name, rtc); 234 if (ret) { 235 dev_err(&pdev->dev, "Failed to request irq %i\n", rtc->irq); 236 return ret; 237 } 238 239 enable_irq_wake(rtc->irq); 240 disable_irq(rtc->irq); 241 242 rtc->clk = clk_get(&pdev->dev, NULL); 243 if (IS_ERR(rtc->clk)) { 244 dev_err(&pdev->dev, "Unable to request clock\n"); 245 return PTR_ERR(rtc->clk); 246 } 247 248 clk_prepare_enable(rtc->clk); 249 250 rtc->clkrate = clk_get_rate(rtc->clk); 251 if (!rtc->clkrate) { 252 dev_err(&pdev->dev, "Unable to fetch clock rate\n"); 253 return -EINVAL; 254 } 255 256 device_set_wakeup_capable(&pdev->dev, 1); 257 258 platform_set_drvdata(pdev, rtc); 259 260 rtc->rtc_dev->ops = &st_rtc_ops; > 261 rtc->range_max = do_div(U64_MAX, rtc->clkrate); 262 263 ret = rtc_register_device(rtc->rtc_dev); 264 if (ret) { 265 clk_disable_unprepare(rtc->clk); 266 return ret; 267 } 268 269 return 0; 270 } 271 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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