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Thu, 09 Jun 2022 18:26:44 +0000 Date: Fri, 10 Jun 2022 02:26:04 +0800 From: kernel test robot To: Arnd Bergmann Cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org Subject: arch/arm/mach-lpc32xx/serial.c:63:6: warning: no previous prototype for 'lpc32xx_loopback_set' Message-ID: <202206100243.FIBW6bJC-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Arnd, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 6bfb56e93bcef41859c2d5ab234ffd80b691be35 commit: 7036440eab3e2d47a775d4616909f8235488d714 ARM: omap1: enable multiplatform date: 6 days ago config: arm-buildonly-randconfig-r012-20220608 (https://download.01.org/0day-ci/archive/20220610/202206100243.FIBW6bJC-lkp@intel.com/config) compiler: arm-linux-gnueabi-gcc (GCC) 11.3.0 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/torvalds/linux.git/commit/?id=7036440eab3e2d47a775d4616909f8235488d714 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 7036440eab3e2d47a775d4616909f8235488d714 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> arch/arm/mach-lpc32xx/serial.c:63:6: warning: no previous prototype for 'lpc32xx_loopback_set' [-Wmissing-prototypes] 63 | void lpc32xx_loopback_set(resource_size_t mapbase, int state) | ^~~~~~~~~~~~~~~~~~~~ vim +/lpc32xx_loopback_set +63 arch/arm/mach-lpc32xx/serial.c e6e912c4964ce5 Kevin Wells 2010-07-27 61 ffba29c9ebd097 Arnd Bergmann 2019-08-09 62 /* LPC3250 Errata HSUART.1: Hang workaround via loopback mode on inactivity */ ffba29c9ebd097 Arnd Bergmann 2019-08-09 @63 void lpc32xx_loopback_set(resource_size_t mapbase, int state) ffba29c9ebd097 Arnd Bergmann 2019-08-09 64 { ffba29c9ebd097 Arnd Bergmann 2019-08-09 65 int bit; ffba29c9ebd097 Arnd Bergmann 2019-08-09 66 u32 tmp; ffba29c9ebd097 Arnd Bergmann 2019-08-09 67 ffba29c9ebd097 Arnd Bergmann 2019-08-09 68 switch (mapbase) { ffba29c9ebd097 Arnd Bergmann 2019-08-09 69 case LPC32XX_HS_UART1_BASE: ffba29c9ebd097 Arnd Bergmann 2019-08-09 70 bit = 0; ffba29c9ebd097 Arnd Bergmann 2019-08-09 71 break; ffba29c9ebd097 Arnd Bergmann 2019-08-09 72 case LPC32XX_HS_UART2_BASE: ffba29c9ebd097 Arnd Bergmann 2019-08-09 73 bit = 1; ffba29c9ebd097 Arnd Bergmann 2019-08-09 74 break; ffba29c9ebd097 Arnd Bergmann 2019-08-09 75 case LPC32XX_HS_UART7_BASE: ffba29c9ebd097 Arnd Bergmann 2019-08-09 76 bit = 6; ffba29c9ebd097 Arnd Bergmann 2019-08-09 77 break; ffba29c9ebd097 Arnd Bergmann 2019-08-09 78 default: ffba29c9ebd097 Arnd Bergmann 2019-08-09 79 WARN(1, "lpc32xx_hs: Warning: Unknown port at %08x\n", mapbase); ffba29c9ebd097 Arnd Bergmann 2019-08-09 80 return; ffba29c9ebd097 Arnd Bergmann 2019-08-09 81 } ffba29c9ebd097 Arnd Bergmann 2019-08-09 82 ffba29c9ebd097 Arnd Bergmann 2019-08-09 83 tmp = readl(LPC32XX_UARTCTL_CLOOP); ffba29c9ebd097 Arnd Bergmann 2019-08-09 84 if (state) ffba29c9ebd097 Arnd Bergmann 2019-08-09 85 tmp |= (1 << bit); ffba29c9ebd097 Arnd Bergmann 2019-08-09 86 else ffba29c9ebd097 Arnd Bergmann 2019-08-09 87 tmp &= ~(1 << bit); ffba29c9ebd097 Arnd Bergmann 2019-08-09 88 writel(tmp, LPC32XX_UARTCTL_CLOOP); ffba29c9ebd097 Arnd Bergmann 2019-08-09 89 } ffba29c9ebd097 Arnd Bergmann 2019-08-09 90 EXPORT_SYMBOL_GPL(lpc32xx_loopback_set); ffba29c9ebd097 Arnd Bergmann 2019-08-09 91 :::::: The code at line 63 was first introduced by commit :::::: ffba29c9ebd0977dbf77bf6064776716a51b8ae5 serial: lpc32xx: allow compile testing :::::: TO: Arnd Bergmann :::::: CC: Arnd Bergmann -- 0-DAY CI Kernel Test Service https://01.org/lkp