Re: [linux-next:master 1875/2100] include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read'

Re: [linux-next:master 1875/2100] include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read'

[Vlastimil Babka]

On 01/29/2016 08:06 AM, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   735cfa51151aeae6df04074165aa36b42481df86
> commit: e8bd33570a656979c09ce66a11ca8864fda8ad0c [1875/2100] mm, printk: introduce new format string for flags-fix
> config: s390-allyesconfig (attached as .config)
> 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 e8bd33570a656979c09ce66a11ca8864fda8ad0c
>         # save the attached .config to linux build tree
>         make.cross ARCH=s390 
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from include/linux/static_key.h:1:0,
>                     from include/linux/tracepoint-defs.h:11,
>                     from include/linux/mmdebug.h:6,
>                     from arch/s390/include/asm/cmpxchg.h:10,
>                     from arch/s390/include/asm/atomic.h:19,
>                     from include/linux/atomic.h:4,
>                     from include/linux/debug_locks.h:5,
>                     from include/linux/lockdep.h:23,
>                     from include/linux/hardirq.h:5,
>                     from include/linux/kvm_host.h:10,
>                     from arch/s390/kernel/asm-offsets.c:10:
>    include/linux/jump_label.h: In function 'static_key_count':
>>> include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read' [-Werror=implicit-function-declaration]
>      return atomic_read(&key->enabled);

Sigh.

I don't get it, there's "#include <linux/atomic.h>" in jump_label.h right before
it gets used. So, what implicit declaration?

BTW, do you really need to use VM_BUG_ON() and thus include mmdebug.h in
arch/s390/include/asm/cmpxchg.h ? Is that assertion really related to VM?

>      ^
>    In file included from include/linux/atomic.h:4:0,
>                     from include/linux/debug_locks.h:5,
>                     from include/linux/lockdep.h:23,
>                     from include/linux/hardirq.h:5,
>                     from include/linux/kvm_host.h:10,
>                     from arch/s390/kernel/asm-offsets.c:10:
>    arch/s390/include/asm/atomic.h: At top level:
>    arch/s390/include/asm/atomic.h:74:19: error: static declaration of 'atomic_read' follows non-static declaration
>     static inline int atomic_read(const atomic_t *v)
>                       ^
>    In file included from include/linux/static_key.h:1:0,
>                     from include/linux/tracepoint-defs.h:11,
>                     from include/linux/mmdebug.h:6,
>                     from arch/s390/include/asm/cmpxchg.h:10,
>                     from arch/s390/include/asm/atomic.h:19,
>                     from include/linux/atomic.h:4,
>                     from include/linux/debug_locks.h:5,
>                     from include/linux/lockdep.h:23,
>                     from include/linux/hardirq.h:5,
>                     from include/linux/kvm_host.h:10,
>                     from arch/s390/kernel/asm-offsets.c:10:
>    include/linux/jump_label.h:122:9: note: previous implicit declaration of 'atomic_read' was here
>      return atomic_read(&key->enabled);
>             ^
>    cc1: some warnings being treated as errors
>    make[2]: *** [arch/s390/kernel/asm-offsets.s] Error 1
>    make[2]: Target '__build' not remade because of errors.
>    make[1]: *** [prepare0] Error 2
>    make[1]: Target 'prepare' not remade because of errors.
>    make: *** [sub-make] Error 2
> 
> vim +/atomic_read +122 include/linux/jump_label.h
> 
> c0ccf6f99 Anton Blanchard 2015-04-09  106  #include <asm/jump_label.h>
> c0ccf6f99 Anton Blanchard 2015-04-09  107  #endif
> c0ccf6f99 Anton Blanchard 2015-04-09  108  
> c0ccf6f99 Anton Blanchard 2015-04-09  109  #ifndef __ASSEMBLY__
> bf5438fca Jason Baron     2010-09-17  110  
> bf5438fca Jason Baron     2010-09-17  111  enum jump_label_type {
> 76b235c6b Peter Zijlstra  2015-07-24  112  	JUMP_LABEL_NOP = 0,
> 76b235c6b Peter Zijlstra  2015-07-24  113  	JUMP_LABEL_JMP,
> bf5438fca Jason Baron     2010-09-17  114  };
> bf5438fca Jason Baron     2010-09-17  115  
> bf5438fca Jason Baron     2010-09-17  116  struct module;
> bf5438fca Jason Baron     2010-09-17  117  
> 851cf6e7d Andrew Jones    2013-08-09  118  #include <linux/atomic.h>
> ea5e9539a Mel Gorman      2014-06-04  119  
> ea5e9539a Mel Gorman      2014-06-04  120  static inline int static_key_count(struct static_key *key)
> ea5e9539a Mel Gorman      2014-06-04  121  {
> ea5e9539a Mel Gorman      2014-06-04 @122  	return atomic_read(&key->enabled);
> ea5e9539a Mel Gorman      2014-06-04  123  }
> ea5e9539a Mel Gorman      2014-06-04  124  
> bf5438fca Jason Baron     2010-09-17  125  #ifdef HAVE_JUMP_LABEL
> bf5438fca Jason Baron     2010-09-17  126  
> a1efb01fe Peter Zijlstra  2015-07-24  127  #define JUMP_TYPE_FALSE	0UL
> a1efb01fe Peter Zijlstra  2015-07-24  128  #define JUMP_TYPE_TRUE	1UL
> a1efb01fe Peter Zijlstra  2015-07-24  129  #define JUMP_TYPE_MASK	1UL
> c5905afb0 Ingo Molnar     2012-02-24  130  
> 
> :::::: The code at line 122 was first introduced by commit
> :::::: ea5e9539abf1258f23e725cb9cb25aa74efa29eb include/linux/jump_label.h: expose the reference count
> 
> :::::: TO: Mel Gorman <mgorman@suse.de>
> :::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
> 

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Re: [linux-next:master 1875/2100] include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read'

[Stephen Rothwell]

Hi Vlastimil,

On Fri, 29 Jan 2016 11:28:59 +0100 Vlastimil Babka <vbabka@suse.cz> wrote:
>
> On 01/29/2016 08:06 AM, kbuild test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head:   735cfa51151aeae6df04074165aa36b42481df86
> > commit: e8bd33570a656979c09ce66a11ca8864fda8ad0c [1875/2100] mm, printk: introduce new format string for flags-fix
> > config: s390-allyesconfig (attached as .config)
> > 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 e8bd33570a656979c09ce66a11ca8864fda8ad0c
> >         # save the attached .config to linux build tree
> >         make.cross ARCH=s390 
> > 
> > All errors (new ones prefixed by >>):
> > 
> >    In file included from include/linux/static_key.h:1:0,
> >                     from include/linux/tracepoint-defs.h:11,
> >                     from include/linux/mmdebug.h:6,
> >                     from arch/s390/include/asm/cmpxchg.h:10,
> >                     from arch/s390/include/asm/atomic.h:19,
> >                     from include/linux/atomic.h:4,
> >                     from include/linux/debug_locks.h:5,
> >                     from include/linux/lockdep.h:23,
> >                     from include/linux/hardirq.h:5,
> >                     from include/linux/kvm_host.h:10,
> >                     from arch/s390/kernel/asm-offsets.c:10:
> >    include/linux/jump_label.h: In function 'static_key_count':  
> >>> include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read' [-Werror=implicit-function-declaration]  
> >      return atomic_read(&key->enabled);  
> 
> Sigh.
> 
> I don't get it, there's "#include <linux/atomic.h>" in jump_label.h right before
> it gets used. So, what implicit declaration?

But we are in the process of reading linux/atomic.h already, and the
#include in jump_label.h will just not read it then (because of the
include guards) so the body of linux/atomic.h has not yet been read
when we process static_key_count().  i.e. we have a circular inclusion.

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au

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Re: [linux-next:master 1875/2100] include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read'

[Vlastimil Babka]

On 01/29/2016 11:53 AM, Stephen Rothwell wrote:
> Hi Vlastimil,
> 
> On Fri, 29 Jan 2016 11:28:59 +0100 Vlastimil Babka <vbabka@suse.cz> wrote:
>> >    include/linux/jump_label.h: In function 'static_key_count':  
>> >>> include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read' [-Werror=implicit-function-declaration]  
>> >      return atomic_read(&key->enabled);  
>> 
>> Sigh.
>> 
>> I don't get it, there's "#include <linux/atomic.h>" in jump_label.h right before
>> it gets used. So, what implicit declaration?
> 
> But we are in the process of reading linux/atomic.h already, and the
> #include in jump_label.h will just not read it then (because of the
> include guards) so the body of linux/atomic.h has not yet been read
> when we process static_key_count().  i.e. we have a circular inclusion.
 
Oh, of course, doh. Thanks.

Please replace the -fix with this patch. Sorry again.

----8<----

Re: [linux-next:master 1875/2100] include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read'

[Stephen Rothwell]

Hi Vlastimil,

On Fri, 29 Jan 2016 12:25:17 +0100 Vlastimil Babka <vbabka@suse.cz> wrote:
>
> Please replace the -fix with this patch. Sorry again.
> 
> ----8<----
> From 1e6b1ae6bf55410fb816cf910c4d91533642072b Mon Sep 17 00:00:00 2001
> From: Vlastimil Babka <vbabka@suse.cz>
> Date: Fri, 29 Jan 2016 12:18:21 +0100
> Subject: [PATCH] mm, printk: introduce new format string for flags-fix
> 
> Due to rebasing mistake, mmdebug.h keeps including tracepoint.h, causing
> header dependency issues on some arches.
> Remove the include, and related declarations of flags arrays, which reside
> in mm/internal.h and lib/vsprintf.c already includes that header.
> 
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
> ---
>  include/linux/mmdebug.h | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
> index 3fb9bc65d61d..de7be78c6f0e 100644
> --- a/include/linux/mmdebug.h
> +++ b/include/linux/mmdebug.h
> @@ -3,17 +3,11 @@
>  
>  #include <linux/bug.h>
>  #include <linux/stringify.h>
> -#include <linux/types.h>
> -#include <linux/tracepoint.h>
>  
>  struct page;
>  struct vm_area_struct;
>  struct mm_struct;
>  
> -extern const struct trace_print_flags pageflag_names[];
> -extern const struct trace_print_flags vmaflag_names[];
> -extern const struct trace_print_flags gfpflag_names[];
> -
>  extern void dump_page(struct page *page, const char *reason);
>  extern void __dump_page(struct page *page, const char *reason);
>  void dump_vma(const struct vm_area_struct *vma);
> -- 
> 2.7.0

OK, I have done that from today.

-- 
Cheers,
Stephen Rothwell

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Re: [linux-next:master 1875/2100] include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read'

[Heiko Carstens]

On Fri, Jan 29, 2016 at 11:28:59AM +0100, Vlastimil Babka wrote:
> On 01/29/2016 08:06 AM, kbuild test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head:   735cfa51151aeae6df04074165aa36b42481df86
> > commit: e8bd33570a656979c09ce66a11ca8864fda8ad0c [1875/2100] mm, printk: introduce new format string for flags-fix
> > config: s390-allyesconfig (attached as .config)
> > 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 e8bd33570a656979c09ce66a11ca8864fda8ad0c
> >         # save the attached .config to linux build tree
> >         make.cross ARCH=s390 
> > 
> > All errors (new ones prefixed by >>):
> > 
> >    In file included from include/linux/static_key.h:1:0,
> >                     from include/linux/tracepoint-defs.h:11,
> >                     from include/linux/mmdebug.h:6,
> >                     from arch/s390/include/asm/cmpxchg.h:10,
> >                     from arch/s390/include/asm/atomic.h:19,
> >                     from include/linux/atomic.h:4,
> >                     from include/linux/debug_locks.h:5,
> >                     from include/linux/lockdep.h:23,
> >                     from include/linux/hardirq.h:5,
> >                     from include/linux/kvm_host.h:10,
> >                     from arch/s390/kernel/asm-offsets.c:10:
> >    include/linux/jump_label.h: In function 'static_key_count':
> >>> include/linux/jump_label.h:122:2: error: implicit declaration of function 'atomic_read' [-Werror=implicit-function-declaration]
> >      return atomic_read(&key->enabled);
> 
> Sigh.
> 
> I don't get it, there's "#include <linux/atomic.h>" in jump_label.h right before
> it gets used. So, what implicit declaration?
> 
> BTW, do you really need to use VM_BUG_ON() and thus include mmdebug.h in
> arch/s390/include/asm/cmpxchg.h ? Is that assertion really related to VM?

That's more or less copied over from x86 (and arm64 has it too). Probably
because the only user used to be SLUB and the author has a strong memory
management background :)

However, I'd like to keep the sanity check.

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