arch/arm/mach-lpc32xx/serial.c:63:6: warning: no previous prototype for 'lpc32xx_loopback_set'
From: kernel test robot
Date: Fri Apr 21 2023 - 18:59:33 EST
Hi Arnd,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8e41e0a575664d26bb87e012c39435c4c3914ed9
commit: 250c1a694ff304e5d69e74ab32755eddcc2b8f65 ARM: pxa: convert to multiplatform
date: 12 months ago
config: arm-buildonly-randconfig-r004-20230421 (https://download.01.org/0day-ci/archive/20230422/202304220650.KSVbcJ8z-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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=250c1a694ff304e5d69e74ab32755eddcc2b8f65
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 250c1a694ff304e5d69e74ab32755eddcc2b8f65
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 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 <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202304220650.KSVbcJ8z-lkp@xxxxxxxxx/
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 <arnd@xxxxxxxx>
:::::: CC: Arnd Bergmann <arnd@xxxxxxxx>
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https://github.com/intel/lkp-tests