tree: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kbuild2 head: 5cd6239506cb97fb00c5992c1adaf6f9f788c5f2 commit: 13d2598cc964173bb063cffda9de778a89cdcfcd [3/5] kernel hacking: add a config option to disable compiler auto-inlining config: arm64-allmodconfig (attached as .config) compiler: aarch64-linux-gnu-gcc (Debian 8.2.0-11) 8.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 13d2598cc964173bb063cffda9de778a89cdcfcd # save the attached .config to linux build tree GCC_VERSION=8.2.0 make.cross ARCH=arm64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/scsi/ufs/ufs-qcom.c: In function 'ufs_qcom_testbus_config': drivers/scsi/ufs/ufs-qcom.c:1559:7: warning: 'offset' may be used uninitialized in this function [-Wmaybe-uninitialized] mask <<= offset; ~~~~~^~~~~~~~~~ In file included from include/linux/io.h:25, from drivers/scsi/ufs/ufshcd.h:44, from drivers/scsi/ufs/ufs-qcom.c:20: >> arch/arm64/include/asm/io.h:84:21: warning: 'reg' may be used uninitialized in this function [-Wmaybe-uninitialized] #define __raw_readl __raw_readl ^~~~~~~~~~~ drivers/scsi/ufs/ufs-qcom.c:1493:6: note: 'reg' was declared here int reg; ^~~ -- drivers/scsi//ufs/ufs-qcom.c: In function 'ufs_qcom_testbus_config': drivers/scsi//ufs/ufs-qcom.c:1559:7: warning: 'offset' may be used uninitialized in this function [-Wmaybe-uninitialized] mask <<= offset; ~~~~~^~~~~~~~~~ In file included from include/linux/io.h:25, from drivers/scsi//ufs/ufshcd.h:44, from drivers/scsi//ufs/ufs-qcom.c:20: >> arch/arm64/include/asm/io.h:84:21: warning: 'reg' may be used uninitialized in this function [-Wmaybe-uninitialized] #define __raw_readl __raw_readl ^~~~~~~~~~~ drivers/scsi//ufs/ufs-qcom.c:1493:6: note: 'reg' was declared here int reg; ^~~ vim +/reg +84 arch/arm64/include/asm/io.h fc47897d Catalin Marinas 2012-03-05 83 09a57239 Thierry Reding 2014-07-28 @84 #define __raw_readl __raw_readl fc47897d Catalin Marinas 2012-03-05 85 static inline u32 __raw_readl(const volatile void __iomem *addr) fc47897d Catalin Marinas 2012-03-05 86 { fc47897d Catalin Marinas 2012-03-05 87 u32 val; 5afaa1fc Andre Przywara 2014-11-14 88 asm volatile(ALTERNATIVE("ldr %w0, [%1]", 5afaa1fc Andre Przywara 2014-11-14 89 "ldar %w0, [%1]", 5afaa1fc Andre Przywara 2014-11-14 90 ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) 5afaa1fc Andre Przywara 2014-11-14 91 : "=r" (val) : "r" (addr)); fc47897d Catalin Marinas 2012-03-05 92 return val; fc47897d Catalin Marinas 2012-03-05 93 } fc47897d Catalin Marinas 2012-03-05 94 :::::: The code at line 84 was first introduced by commit :::::: 09a5723983e383e7d627fe3191366761722695bc arm64: Use include/asm-generic/io.h :::::: TO: Thierry Reding <treding@xxxxxxxxxx> :::::: CC: Thierry Reding <treding@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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