linux-kernel - Re: tools/liblockdep: Build failure

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Date:	Tue, 1 Apr 2014 10:11:44 +0200
From:	Robin Hack <rhack@...hat.com>
To:	Eunbong Song <eunb.song@...sung.com>
Cc:	ak@...ux.intel.com, sasha.levin@...cle.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: tools/liblockdep: Build failure

More investigation reveals this:

(from common.o which is output of gcc -E)
# 1 "./uinclude/linux/linkage.h" 1

pwd is: linux/tools/lib/lockdep
$ cat ./uinclude/linux/linkage.h

/* empty file */


Have nice day
Robin Hack
On Tue, Apr 01, 2014 at 10:02:58AM +0200, Robin Hack wrote:
> Hi.
> 
> I have same issue.
> 
> I investigated output of gcc -E and I found that asmlinkage macro isn't
> expanded as is expected.
> 
> $ grep asmlinkage common.o
> asmlinkage extern void lockdep_sys_exit(void);
> 
> On Tue, Apr 01, 2014 at 06:04:35AM +0000, Eunbong Song wrote:
> > 
> > There is tools/liblockdep build failure.
> > I have been trying to find the cause and i found commit id 63f9a7fde715352e0769302527670542a664b981 is the casue.
> > 
> > Author: Andi Kleen <ak@...ux.intel.com>
> > Date:   Sat Feb 8 08:52:01 2014 +0100
> > 
> >     asmlinkage: Make lockdep_sys_exit asmlinkage
> > 
> >     lockdep_sys_exit can be called from assembler code, so make it
> >     asmlinkage.
> > 
> >     Cc: Peter Zijlstra <peterz@...radead.org>
> >     Cc: Ingo Molnar <mingo@...nel.org>
> >     Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> >     Link: http://lkml.kernel.org/r/1391845930-28580-5-git-send-email-ak@linux.intel.com
> >     Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
> > 
> > diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
> > index 92b1bfc..7df9aa6 100644
> > --- a/include/linux/lockdep.h
> > +++ b/include/linux/lockdep.h
> > @@ -265,7 +265,7 @@ extern void lockdep_info(void);
> >  extern void lockdep_reset(void);
> >  extern void lockdep_reset_lock(struct lockdep_map *lock);
> >  extern void lockdep_free_key_range(void *start, unsigned long size);
> > -extern void lockdep_sys_exit(void);
> > +extern asmlinkage void lockdep_sys_exit(void);
> > 
> >  extern void lockdep_off(void);
> >  extern void lockdep_on(void);
> > diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
> > index eb8a547..c8b6753 100644
> > --- a/kernel/locking/lockdep.c
> > +++ b/kernel/locking/lockdep.c
> > @@ -4191,7 +4191,7 @@ void debug_show_held_locks(struct task_struct *task)
> >  }
> >  EXPORT_SYMBOL_GPL(debug_show_held_locks);
> > 
> > -void lockdep_sys_exit(void)
> > +asmlinkage void lockdep_sys_exit(void)
> >  {
> >         struct task_struct *curr = current;
> --
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