tree: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git build-test2 head: dfc95c6ebbf550ee91f70b67c45396685bf4e055 commit: dfc95c6ebbf550ee91f70b67c45396685bf4e055 [2/2] compiler-attribute: stop forcing __always_inline to inline marker config: s390-defconfig (attached as .config) compiler: s390x-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout dfc95c6ebbf550ee91f70b67c45396685bf4e055 # save the attached .config to linux build tree GCC_VERSION=7.2.0 make.cross ARCH=s390 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 >>): In file included from include/linux/uaccess.h:11:0, from include/linux/crypto.h:26, from include/crypto/hash.h:16, from include/linux/uio.h:14, from include/linux/socket.h:8, from include/linux/skbuff.h:23, from include/linux/if_ether.h:23, from arch/s390/include/asm/diag.h:12, from arch/s390/include/asm/kvm_para.h:25, from include/uapi/linux/kvm_para.h:35, from include/linux/kvm_para.h:5, from include/linux/kvm_host.h:34, from arch/s390/kvm/kvm-s390.c:23: arch/s390/include/asm/uaccess.h: In function '__get_user_fn': >> arch/s390/include/asm/uaccess.h:141:9: warning: 'rc' may be used uninitialized in this function [-Wmaybe-uninitialized] return rc; ^~ -- arch/s390/mm/fault.c: In function 'dump_fault_info': >> arch/s390/mm/fault.c:127:15: warning: 'asce' may be used uninitialized in this function [-Wmaybe-uninitialized] switch (asce & _ASCE_TYPE_MASK) { arch/s390/mm/fault.c:177:16: note: 'asce' was declared here unsigned long asce; ^~~~ vim +/rc +141 arch/s390/include/asm/uaccess.h dc4aace1 Heiko Carstens 2016-06-20 113 dc4aace1 Heiko Carstens 2016-06-20 114 static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size) dc4aace1 Heiko Carstens 2016-06-20 115 { 0aaba41b Martin Schwidefsky 2017-08-22 116 unsigned long spec = 0x01UL; dc4aace1 Heiko Carstens 2016-06-20 117 int rc; dc4aace1 Heiko Carstens 2016-06-20 118 dc4aace1 Heiko Carstens 2016-06-20 119 switch (size) { dc4aace1 Heiko Carstens 2016-06-20 120 case 1: dc4aace1 Heiko Carstens 2016-06-20 121 rc = __put_get_user_asm((unsigned char *)x, dc4aace1 Heiko Carstens 2016-06-20 122 (unsigned char __user *)ptr, dc4aace1 Heiko Carstens 2016-06-20 123 size, spec); dc4aace1 Heiko Carstens 2016-06-20 124 break; dc4aace1 Heiko Carstens 2016-06-20 125 case 2: dc4aace1 Heiko Carstens 2016-06-20 126 rc = __put_get_user_asm((unsigned short *)x, dc4aace1 Heiko Carstens 2016-06-20 127 (unsigned short __user *)ptr, dc4aace1 Heiko Carstens 2016-06-20 128 size, spec); dc4aace1 Heiko Carstens 2016-06-20 129 break; dc4aace1 Heiko Carstens 2016-06-20 130 case 4: dc4aace1 Heiko Carstens 2016-06-20 131 rc = __put_get_user_asm((unsigned int *)x, dc4aace1 Heiko Carstens 2016-06-20 132 (unsigned int __user *)ptr, dc4aace1 Heiko Carstens 2016-06-20 133 size, spec); dc4aace1 Heiko Carstens 2016-06-20 134 break; dc4aace1 Heiko Carstens 2016-06-20 135 case 8: dc4aace1 Heiko Carstens 2016-06-20 136 rc = __put_get_user_asm((unsigned long *)x, dc4aace1 Heiko Carstens 2016-06-20 137 (unsigned long __user *)ptr, dc4aace1 Heiko Carstens 2016-06-20 138 size, spec); dc4aace1 Heiko Carstens 2016-06-20 139 break; 0b925159 Heiko Carstens 2017-01-02 140 } dc4aace1 Heiko Carstens 2016-06-20 @141 return rc; dc4aace1 Heiko Carstens 2016-06-20 142 } c9ca7841 Heiko Carstens 2014-04-17 143 :::::: The code at line 141 was first introduced by commit :::::: dc4aace160165bd15400a79f9f5ab97405278f48 s390/uaccess: fix __put_get_user_asm define :::::: TO: Heiko Carstens <heiko.carstens@xxxxxxxxxx> :::::: CC: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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