[memcg:since-4.6 827/827] arch/s390/include/asm/jump_label.h:17:32: error: expected ':' before '__stringify'

kbuild test robot
2016-07-13T17:14:42Z

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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@de.ibm.com>
:::::: CC: Martin Schwidefsky <schwidefsky@de.ibm.com>

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