Hi Janne, kernel test robot noticed the following build warnings: [auto build test WARNING on 15d30b46573d75f5cb58cfacded8ebab9c76a2b0] url: https://github.com/intel-lab-lkp/linux/commits/Janne-Grunau-via-B4-Relay/drm-simpledrm-Add-support-for-multiple-power-domains/20230911-004026 base: 15d30b46573d75f5cb58cfacded8ebab9c76a2b0 patch link: https://lore.kernel.org/r/20230910-simpledrm-multiple-power-domains-v1-1-f8718aefc685%40jannau.net patch subject: [PATCH] drm/simpledrm: Add support for multiple "power-domains" config: arm64-randconfig-r003-20230912 (https://download.01.org/0day-ci/archive/20230912/202309122212.MetCn4UK-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230912/202309122212.MetCn4UK-lkp@xxxxxxxxx/reproduce) 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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202309122212.MetCn4UK-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/tiny/simpledrm.c:506:24: warning: flag ' ' results in undefined behavior with 'p' conversion specifier [-Wformat] 506 | drm_err(&sdev->dev, "% power-domains count:%d\n", __func__, sdev->pwr_dom_count); | ~^~ include/drm/drm_print.h:469:39: note: expanded from macro 'drm_err' 469 | __drm_printk((drm), err,, "*ERROR* " fmt, ##__VA_ARGS__) | ^~~ include/drm/drm_print.h:456:41: note: expanded from macro '__drm_printk' 456 | dev_##level##type((drm)->dev, "[drm] " fmt, ##__VA_ARGS__) | ^~~ include/linux/dev_printk.h:144:57: note: expanded from macro 'dev_err' 144 | dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__) | ^~~ include/linux/dev_printk.h:19:22: note: expanded from macro 'dev_fmt' 19 | #define dev_fmt(fmt) fmt | ^~~ include/linux/dev_printk.h:110:16: note: expanded from macro 'dev_printk_index_wrap' 110 | _p_func(dev, fmt, ##__VA_ARGS__); \ | ^~~ 1 warning generated. vim +506 drivers/gpu/drm/tiny/simpledrm.c 477 478 #if defined CONFIG_OF && defined CONFIG_PM_GENERIC_DOMAINS 479 /* 480 * Generic power domain handling code. 481 * 482 * Here we handle the power-domains properties of our "simple-framebuffer" 483 * dt node. This is only necessary if there is more than one power-domain. 484 * A single power-domains is handled automatically by the driver core. Multiple 485 * power-domains have to be handled by drivers since the driver core can't know 486 * the correct power sequencing. Power sequencing is not an issue for simpledrm 487 * since the bootloader has put the power domains already in the correct state. 488 * simpledrm has only to ensure they remain active for its lifetime. 489 * 490 * When the driver unloads, we detach from the power-domains. 491 * 492 * We only complain about errors here, no action is taken as the most likely 493 * error can only happen due to a mismatch between the bootloader which set 494 * up the "simple-framebuffer" dt node, and the PM domain providers in the 495 * device tree. Chances are that there are no adverse effects, and if there are, 496 * a clean teardown of the fb probe will not help us much either. So just 497 * complain and carry on, and hope that the user actually gets a working fb at 498 * the end of things. 499 */ 500 static void simpledrm_device_detach_genpd(void *res) 501 { 502 int i; 503 struct simpledrm_device *sdev = /*(struct simpledrm_device *)*/res; 504 505 > 506 drm_err(&sdev->dev, "% power-domains count:%d\n", __func__, sdev->pwr_dom_count); 507 if (sdev->pwr_dom_count <= 1) 508 return; 509 510 for (i = sdev->pwr_dom_count - 1; i >= 0; i--) { 511 if (!sdev->pwr_dom_links[i]) 512 device_link_del(sdev->pwr_dom_links[i]); 513 if (!IS_ERR_OR_NULL(sdev->pwr_dom_devs[i])) 514 dev_pm_domain_detach(sdev->pwr_dom_devs[i], true); 515 } 516 } 517 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
