Re: [PATCH 1/1] bug: fix problem including <linux.bug.h> from linux/kernel.h

From: kbuild test robot
Date: Wed May 24 2017 - 22:47:53 EST

Hi Ian,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.12-rc2 next-20170524]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Ian-Abbott/bug-fix-problem-including-linux-bug-h-from-linux-kernel-h/20170525-081427
config: powerpc-allmodconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=powerpc

All error/warnings (new ones prefixed by >>):

In file included from arch/powerpc/include/asm/bug.h:127:0,
from include/linux/bug.h:4,
from arch/powerpc/include/asm/mmu.h:125,
from arch/powerpc/include/asm/lppaca.h:36,
from arch/powerpc/include/asm/paca.h:21,
from arch/powerpc/include/asm/current.h:16,
from include/linux/sched.h:11,
from include/linux/utsname.h:5,
from drivers/char/random.c:238:
include/asm-generic/bug.h:101:13: warning: 'struct pt_regs' declared inside parameter list will not be visible outside of this definition or declaration
struct pt_regs *regs, struct warn_args *args);
^~~~~~~
In file included from arch/powerpc/include/asm/lppaca.h:36:0,
from arch/powerpc/include/asm/paca.h:21,
from arch/powerpc/include/asm/current.h:16,
from include/linux/sched.h:11,
from include/linux/utsname.h:5,
from drivers/char/random.c:238:
arch/powerpc/include/asm/mmu.h: In function 'mmu_has_feature':
>> arch/powerpc/include/asm/mmu.h:174:3: error: implicit declaration of function 'printk' [-Werror=implicit-function-declaration]
printk("Warning! mmu_has_feature() used prior to jump label init!\n");
^~~~~~
>> arch/powerpc/include/asm/mmu.h:175:3: error: implicit declaration of function 'dump_stack' [-Werror=implicit-function-declaration]
dump_stack();
^~~~~~~~~~
In file included from include/linux/kernel.h:13:0,
from arch/powerpc/include/asm/page.h:15,
from arch/powerpc/include/asm/book3s/64/mmu-hash.h:16,
from arch/powerpc/include/asm/book3s/64/mmu.h:29,
from arch/powerpc/include/asm/mmu.h:304,
from arch/powerpc/include/asm/lppaca.h:36,
from arch/powerpc/include/asm/paca.h:21,
from arch/powerpc/include/asm/current.h:16,
from include/linux/sched.h:11,
from include/linux/utsname.h:5,
from drivers/char/random.c:238:
include/linux/printk.h: At top level:
include/linux/printk.h:172:5: error: conflicting types for 'printk'
int printk(const char *fmt, ...);
^~~~~~
include/linux/printk.h:172:1: note: a parameter list with an ellipsis can't match an empty parameter name list declaration
int printk(const char *fmt, ...);
^~~
In file included from arch/powerpc/include/asm/lppaca.h:36:0,
from arch/powerpc/include/asm/paca.h:21,
from arch/powerpc/include/asm/current.h:16,
from include/linux/sched.h:11,
from include/linux/utsname.h:5,
from drivers/char/random.c:238:
arch/powerpc/include/asm/mmu.h:174:3: note: previous implicit declaration of 'printk' was here
printk("Warning! mmu_has_feature() used prior to jump label init!\n");
^~~~~~
In file included from include/linux/kernel.h:13:0,
from arch/powerpc/include/asm/page.h:15,
from arch/powerpc/include/asm/book3s/64/mmu-hash.h:16,
from arch/powerpc/include/asm/book3s/64/mmu.h:29,
from arch/powerpc/include/asm/mmu.h:304,
from arch/powerpc/include/asm/lppaca.h:36,
from arch/powerpc/include/asm/paca.h:21,
from arch/powerpc/include/asm/current.h:16,
from include/linux/sched.h:11,
from include/linux/utsname.h:5,
from drivers/char/random.c:238:
>> include/linux/printk.h:282:24: warning: conflicting types for 'dump_stack'
extern asmlinkage void dump_stack(void) __cold;
^~~~~~~~~~
In file included from arch/powerpc/include/asm/lppaca.h:36:0,
from arch/powerpc/include/asm/paca.h:21,
from arch/powerpc/include/asm/current.h:16,
from include/linux/sched.h:11,
from include/linux/utsname.h:5,
from drivers/char/random.c:238:
arch/powerpc/include/asm/mmu.h:175:3: note: previous implicit declaration of 'dump_stack' was here
dump_stack();
^~~~~~~~~~
cc1: some warnings being treated as errors

vim +/printk +174 arch/powerpc/include/asm/mmu.h

b5fa0f7f8 Michael Ellerman 2017-01-24 168 #ifndef __clang__ /* clang can't cope with this */
c12e6f24d Kevin Hao 2016-07-23 169 BUILD_BUG_ON(!__builtin_constant_p(feature));
b5fa0f7f8 Michael Ellerman 2017-01-24 170 #endif
c12e6f24d Kevin Hao 2016-07-23 171
c812c7d8f Aneesh Kumar K.V 2016-07-23 172 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
c812c7d8f Aneesh Kumar K.V 2016-07-23 173 if (!static_key_initialized) {
c812c7d8f Aneesh Kumar K.V 2016-07-23 @174 printk("Warning! mmu_has_feature() used prior to jump label init!\n");
c812c7d8f Aneesh Kumar K.V 2016-07-23 @175 dump_stack();
c812c7d8f Aneesh Kumar K.V 2016-07-23 176 return early_mmu_has_feature(feature);
c812c7d8f Aneesh Kumar K.V 2016-07-23 177 }
c812c7d8f Aneesh Kumar K.V 2016-07-23 178 #endif

:::::: The code at line 174 was first introduced by commit
:::::: c812c7d8f1470ac9c8aa6d7e29b56e5845ee05fc powerpc/mm: Catch usage of cpu/mmu_has_feature() before jump label init

:::::: TO: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
:::::: CC: Michael Ellerman <mpe@xxxxxxxxxxxxxx>

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