tree: https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git for-linus head: a037c2e43b434cf845a4521d6b2865f27047c1db commit: a037c2e43b434cf845a4521d6b2865f27047c1db [23/23] s390: correct nospec auto detection init order config: s390-allmodconfig (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 a037c2e43b434cf845a4521d6b2865f27047c1db # save the attached .config to linux build tree make.cross ARCH=s390 All warnings (new ones prefixed by >>): arch/s390/kernel/nospec-branch.c: In function 'nospec_auto_detect': >> arch/s390/kernel/nospec-branch.c:90:9: warning: 'return' with a value, in function returning void return 0; ^ arch/s390/kernel/nospec-branch.c:75:13: note: declared here void __init nospec_auto_detect(void) ^~~~~~~~~~~~~~~~~~ vim +/return +90 arch/s390/kernel/nospec-branch.c f19fbd5e Martin Schwidefsky 2018-01-26 74 a037c2e4 Martin Schwidefsky 2018-04-11 75 void __init nospec_auto_detect(void) f19fbd5e Martin Schwidefsky 2018-01-26 76 { 6e179d64 Martin Schwidefsky 2018-03-23 77 if (IS_ENABLED(CC_USING_EXPOLINE)) { 6e179d64 Martin Schwidefsky 2018-03-23 78 /* 6e179d64 Martin Schwidefsky 2018-03-23 79 * The kernel has been compiled with expolines. 6e179d64 Martin Schwidefsky 2018-03-23 80 * Keep expolines enabled and disable nobp. 6e179d64 Martin Schwidefsky 2018-03-23 81 */ 6e179d64 Martin Schwidefsky 2018-03-23 82 nospec_disable = 0; 6e179d64 Martin Schwidefsky 2018-03-23 83 __clear_facility(82, S390_lowcore.alt_stfle_fac_list); f19fbd5e Martin Schwidefsky 2018-01-26 84 } 6e179d64 Martin Schwidefsky 2018-03-23 85 /* 6e179d64 Martin Schwidefsky 2018-03-23 86 * If the kernel has not been compiled with expolines the 6e179d64 Martin Schwidefsky 2018-03-23 87 * nobp setting decides what is done, this depends on the 6e179d64 Martin Schwidefsky 2018-03-23 88 * CONFIG_KERNEL_NP option and the nobp/nospec parameters. 6e179d64 Martin Schwidefsky 2018-03-23 89 */ 6e179d64 Martin Schwidefsky 2018-03-23 @90 return 0; f19fbd5e Martin Schwidefsky 2018-01-26 91 } 6e179d64 Martin Schwidefsky 2018-03-23 92 :::::: The code at line 90 was first introduced by commit :::::: 6e179d64126b909f0b288fa63cdbf07c531e9b1d s390: add automatic detection of the spectre defense :::::: TO: Martin Schwidefsky <schwidefsky@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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