I haven't checked the complete context, but it seems that *irq that is tested on line 431 is unsigned.
julia On Thu, 3 Nov 2016, kbuild test robot wrote: > Hi Quentin, > > [auto build test WARNING on next-20161028] > [cannot apply to iio/togreg input/next linus/master v4.9-rc3 v4.9-rc2 > v4.9-rc1 v4.9-rc3] > [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/Quentin-Schulz/add-support-for-Allwinner-SoCs-ADC/20161103-182828 > :::::: branch date: 2 hours ago > :::::: commit date: 2 hours ago > > >> drivers/iio/adc/sun4i-gpadc-iio.c:431:5-9: WARNING: Unsigned expression > >> compared with zero: * irq < 0 > > git remote add linux-review https://github.com/0day-ci/linux > git remote update linux-review > git checkout 0068e4d1386fff54958ef3b8b304239982feaa8a > vim +431 drivers/iio/adc/sun4i-gpadc-iio.c > > 0068e4d1 Quentin Schulz 2016-11-03 415 > 0068e4d1 Quentin Schulz 2016-11-03 416 /* > 0068e4d1 Quentin Schulz 2016-11-03 417 * Once the interrupt is > activated, the IP continuously performs > 0068e4d1 Quentin Schulz 2016-11-03 418 * conversions thus throws > interrupts. The interrupt is activated right > 0068e4d1 Quentin Schulz 2016-11-03 419 * after being requested but we > want to control when these interrupts > 0068e4d1 Quentin Schulz 2016-11-03 420 * occur thus we disable it > right after being requested. However, an > 0068e4d1 Quentin Schulz 2016-11-03 421 * interrupt might occur > between these two instructions and we have to > 0068e4d1 Quentin Schulz 2016-11-03 422 * make sure that does not > happen, by using atomic flags. We set the > 0068e4d1 Quentin Schulz 2016-11-03 423 * flag before requesting the > interrupt and unset it right after > 0068e4d1 Quentin Schulz 2016-11-03 424 * disabling the interrupt. > When an interrupt occurs between these two > 0068e4d1 Quentin Schulz 2016-11-03 425 * instructions, reading the > atomic flag will tell us to ignore the > 0068e4d1 Quentin Schulz 2016-11-03 426 * interrupt. > 0068e4d1 Quentin Schulz 2016-11-03 427 */ > 0068e4d1 Quentin Schulz 2016-11-03 428 atomic_set(atomic, 1); > 0068e4d1 Quentin Schulz 2016-11-03 429 > 0068e4d1 Quentin Schulz 2016-11-03 430 *irq = > platform_get_irq_byname(pdev, name); > 0068e4d1 Quentin Schulz 2016-11-03 @431 if (*irq < 0) { > 0068e4d1 Quentin Schulz 2016-11-03 432 dev_err(&pdev->dev, "no > %s interrupt registered\n", name); > 0068e4d1 Quentin Schulz 2016-11-03 433 return *irq; > 0068e4d1 Quentin Schulz 2016-11-03 434 } > 0068e4d1 Quentin Schulz 2016-11-03 435 > 0068e4d1 Quentin Schulz 2016-11-03 436 *irq = > regmap_irq_get_virq(mfd_dev->regmap_irqc, *irq); > 0068e4d1 Quentin Schulz 2016-11-03 437 ret = > devm_request_any_context_irq(&pdev->dev, *irq, handler, 0, > 0068e4d1 Quentin Schulz 2016-11-03 438 > devname, info); > 0068e4d1 Quentin Schulz 2016-11-03 439 if (ret < 0) { > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation >
