tree: https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git sunxi/clk-for-5.17 head: c81821db64a8957e8ff4ebd4cdda60243ab5c949 commit: 72928074833fef3290e89f00dc471c037bcebc0c [4/10] clk: sunxi-ng: Allow the CCU core to be built as a module config: parisc-buildonly-randconfig-r005-20211123 (https://download.01.org/0day-ci/archive/20211123/202111231442.Mg1z9HFF-lk...) compiler: hppa-linux-gcc (GCC) 11.2.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git/commit/?i... git remote add sunxi https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git git fetch --no-tags sunxi sunxi/clk-for-5.17 git checkout 72928074833fef3290e89f00dc471c037bcebc0c # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc SHELL=/bin/bash drivers/clk/sunxi-ng/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c: In function 'suniv_f1c100s_ccu_setup': 532 | reg = devm_platform_ioremap_resource(pdev, 0); | ^~~~ drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c:532:46: note: each undeclared identifier is reported only once for each function it appears in drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c:534:24: error: 'return' with a value, in function returning void [-Werror=return-type] 534 | return PTR_ERR(reg); | ^~~~~~~~~~~~ drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c:526:20: note: declared here 526 | static void __init suniv_f1c100s_ccu_setup(struct device_node *node) | ^~~~~~~~~~~~~~~~~~~~~~~ drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c:543:24: error: 'return' with a value, in function returning void [-Werror=return-type] 543 | return ret; | ^~~ drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c:526:20: note: declared here 526 | static void __init suniv_f1c100s_ccu_setup(struct device_node *node) | ^~~~~~~~~~~~~~~~~~~~~~~ drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c:552:16: error: 'return' with a value, in function returning void [-Werror=return-type] 552 | return 0; | ^ drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c:526:20: note: declared here 526 | static void __init suniv_f1c100s_ccu_setup(struct device_node *node) | ^~~~~~~~~~~~~~~~~~~~~~~ drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c: At top level: 561 | .probe = suniv_f1c100s_ccu_probe, | ^~~~~~~~~~~~~~~~~~~~~~~ | suniv_f1c100s_ccu_driver drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c:526:20: warning: 'suniv_f1c100s_ccu_setup' defined but not used [-Wunused-function] 526 | static void __init suniv_f1c100s_ccu_setup(struct device_node *node) | ^~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/pdev +532 drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c 0380126eb9afc4 Mesih Kilinc 2018-12-02 525 0380126eb9afc4 Mesih Kilinc 2018-12-02 526 static void __init suniv_f1c100s_ccu_setup(struct device_node *node) 0380126eb9afc4 Mesih Kilinc 2018-12-02 527 { 0380126eb9afc4 Mesih Kilinc 2018-12-02 528 void __iomem *reg; 72dc8e122383fc Samuel Holland 2021-11-18 529 int ret; 0380126eb9afc4 Mesih Kilinc 2018-12-02 530 u32 val; 0380126eb9afc4 Mesih Kilinc 2018-12-02 531 72dc8e122383fc Samuel Holland 2021-11-18 @532 reg = devm_platform_ioremap_resource(pdev, 0); 72dc8e122383fc Samuel Holland 2021-11-18 533 if (IS_ERR(reg)) 72dc8e122383fc Samuel Holland 2021-11-18 534 return PTR_ERR(reg); 0380126eb9afc4 Mesih Kilinc 2018-12-02 535 0380126eb9afc4 Mesih Kilinc 2018-12-02 536 /* Force the PLL-Audio-1x divider to 4 */ 0380126eb9afc4 Mesih Kilinc 2018-12-02 537 val = readl(reg + SUNIV_PLL_AUDIO_REG); 0380126eb9afc4 Mesih Kilinc 2018-12-02 538 val &= ~GENMASK(19, 16); 0380126eb9afc4 Mesih Kilinc 2018-12-02 539 writel(val | (3 << 16), reg + SUNIV_PLL_AUDIO_REG); 0380126eb9afc4 Mesih Kilinc 2018-12-02 540 72dc8e122383fc Samuel Holland 2021-11-18 541 ret = devm_sunxi_ccu_probe(&pdev->dev, reg, &suniv_ccu_desc); 72dc8e122383fc Samuel Holland 2021-11-18 542 if (ret) 72dc8e122383fc Samuel Holland 2021-11-18 543 return ret; 0380126eb9afc4 Mesih Kilinc 2018-12-02 544 0380126eb9afc4 Mesih Kilinc 2018-12-02 545 /* Gate then ungate PLL CPU after any rate changes */ 0380126eb9afc4 Mesih Kilinc 2018-12-02 546 ccu_pll_notifier_register(&suniv_pll_cpu_nb); 0380126eb9afc4 Mesih Kilinc 2018-12-02 547 0380126eb9afc4 Mesih Kilinc 2018-12-02 548 /* Reparent CPU during PLL CPU rate changes */ 0380126eb9afc4 Mesih Kilinc 2018-12-02 549 ccu_mux_notifier_register(pll_cpu_clk.common.hw.clk, 0380126eb9afc4 Mesih Kilinc 2018-12-02 550 &suniv_cpu_nb); 72dc8e122383fc Samuel Holland 2021-11-18 551 72dc8e122383fc Samuel Holland 2021-11-18 @552 return 0; 0380126eb9afc4 Mesih Kilinc 2018-12-02 553 } 72dc8e122383fc Samuel Holland 2021-11-18 554 72dc8e122383fc Samuel Holland 2021-11-18 555 static const struct of_device_id suniv_f1c100s_ccu_ids[] = { 72dc8e122383fc Samuel Holland 2021-11-18 556 { .compatible = "allwinner,suniv-f1c100s-ccu" }, 72dc8e122383fc Samuel Holland 2021-11-18 557 { } 72dc8e122383fc Samuel Holland 2021-11-18 558 }; 72dc8e122383fc Samuel Holland 2021-11-18 559 72dc8e122383fc Samuel Holland 2021-11-18 560 static struct platform_driver suniv_f1c100s_ccu_driver = { 72dc8e122383fc Samuel Holland 2021-11-18 @561 .probe = suniv_f1c100s_ccu_probe, 72dc8e122383fc Samuel Holland 2021-11-18 562 .driver = { 72dc8e122383fc Samuel Holland 2021-11-18 563 .name = "suniv-f1c100s-ccu", 72dc8e122383fc Samuel Holland 2021-11-18 564 .suppress_bind_attrs = true, 72dc8e122383fc Samuel Holland 2021-11-18 565 .of_match_table = suniv_f1c100s_ccu_ids, 72dc8e122383fc Samuel Holland 2021-11-18 566 }, 72dc8e122383fc Samuel Holland 2021-11-18 567 }; 72dc8e122383fc Samuel Holland 2021-11-18 568 module_platform_driver(suniv_f1c100s_ccu_driver); 72dc8e122383fc Samuel Holland 2021-11-18 569 :::::: The code at line 532 was first introduced by commit :::::: 72dc8e122383fcce2ef6d32e351ec0609bd7ca49 clk: sunxi-ng: Convert early providers to platform drivers :::::: TO: Samuel Holland <samuel(a)sholland.org&gt; :::::: CC: Maxime Ripard <maxime(a)cerno.tech&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org