tree: https://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-4.6 head: 92b971babd4ca0b796a247752839f82b6f77a5e7 commit: 92b971babd4ca0b796a247752839f82b6f77a5e7 [827/827] jump_label: remove bug.h, atomic.h dependencies for HAVE_JUMP_LABEL config: s390-default_defconfig (attached as .config) compiler: s390x-linux-gnu-gcc (Debian 5.3.1-8) 5.3.1 20160205 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 92b971babd4ca0b796a247752839f82b6f77a5e7 # save the attached .config to linux build tree make.cross ARCH=s390 All error/warnings (new ones prefixed by >>): In file included from include/linux/compiler.h:60:0, from include/uapi/linux/stddef.h:1, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/linux/jump_label.h:77, from arch/s390/lib/uaccess.c:10: arch/s390/include/asm/jump_label.h: In function 'arch_static_branch': >> arch/s390/include/asm/jump_label.h:17:32: error: expected ':' before '__stringify' asm_volatile_goto("0: brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n" ^ include/linux/compiler-gcc.h:243:47: note: in definition of macro 'asm_volatile_goto' #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) ^ In file included from include/linux/jump_label.h:105:0, from arch/s390/lib/uaccess.c:10: >> arch/s390/include/asm/jump_label.h:25:1: warning: label 'label' defined but not used [-Wunused-label] label: ^ vim +17 arch/s390/include/asm/jump_label.h d5caa4db Heiko Carstens 2015-01-29 11 /* d5caa4db Heiko Carstens 2015-01-29 12 * We use a brcl 0,2 instruction for jump labels at compile time so it d5caa4db Heiko Carstens 2015-01-29 13 * can be easily distinguished from a hotpatch generated instruction. d5caa4db Heiko Carstens 2015-01-29 14 */ 11276d53 Peter Zijlstra 2015-07-24 15 static __always_inline bool arch_static_branch(struct static_key *key, bool branch) 5373db88 Jan Glauber 2011-03-16 16 { d5caa4db Heiko Carstens 2015-01-29 @17 asm_volatile_goto("0: brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n" 5373db88 Jan Glauber 2011-03-16 18 ".pushsection __jump_table, \"aw\"\n" 5a79859a Heiko Carstens 2015-02-12 19 ".balign 8\n" 5a79859a Heiko Carstens 2015-02-12 20 ".quad 0b, %l[label], %0\n" 5373db88 Jan Glauber 2011-03-16 21 ".popsection\n" 11276d53 Peter Zijlstra 2015-07-24 22 : : "X" (&((char *)key)[branch]) : : label); 11276d53 Peter Zijlstra 2015-07-24 23 11276d53 Peter Zijlstra 2015-07-24 24 return false; 11276d53 Peter Zijlstra 2015-07-24 @25 label: 11276d53 Peter Zijlstra 2015-07-24 26 return true; 11276d53 Peter Zijlstra 2015-07-24 27 } 11276d53 Peter Zijlstra 2015-07-24 28 :::::: The code at line 17 was first introduced by commit :::::: d5caa4dbf9bd2ad8cd7f6be0ca76722be947182b s390/jump label: use different nop instruction :::::: 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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