Re: include/linux/kprobes.h:332:2: error: invalid use of undefined type 'struct kprobe_ctlblk'

[Fengguang Wu]

CC David Howells. It looks this error is specific to mn10300 and
allmodconfig/allyesconfig.

The last solution is to quiet reports for such old errors, if
mn10300-allmodconfig/allyesconfig are not interested combinations.

Thanks,
Fengguang

On Mon, Sep 12, 2016 at 09:04:07AM -0500, Christoph Lameter wrote:
> Could someone figure this out? Its been there for years.
>
> On Sun, 11 Sep 2016, kbuild test robot wrote:
>
> > Hi Christoph,
> >
> > FYI, the error/warning still remains.
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   98ac9a608dc79ba8a20cee77fe959a6dfccdaa63
> > commit: abec1a806e0c3cf168999667d5fb6218398ef12a percpu: Make __verify_pcu_ptr handle per cpu pointers to arrays
> > date:   3 years, 1 month ago
> > config: mn10300-allmodconfig (attached as .config)
> > compiler: am33_2.0-linux-gcc (GCC) 4.9.0
> > 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 abec1a806e0c3cf168999667d5fb6218398ef12a
> >         # save the attached .config to linux build tree
> >         make.cross ARCH=mn10300
> >
> > All errors (new ones prefixed by >>):
> >
> >    In file included from net/dccp/probe.c:26:0:
> >    include/linux/kprobes.h: In function 'get_kprobe_ctlblk':
> > >> include/linux/kprobes.h:332:2: error: invalid use of undefined type 'struct kprobe_ctlblk'
> >      return (&__get_cpu_var(kprobe_ctlblk));
> >      ^
> >    In file included from arch/mn10300/include/asm/percpu.h:1:0,
> >                     from include/linux/percpu.h:10,
> >                     from include/linux/kprobes.h:38,
> >                     from net/dccp/probe.c:26:
> >    include/asm-generic/percpu.h:83:29: error: dereferencing pointer to incomplete type
> >     #define __get_cpu_var(var) (*VERIFY_PERCPU_PTR(&(var)))
> >                                 ^
> >    include/linux/kprobes.h:332:11: note: in expansion of macro '__get_cpu_var'
> >      return (&__get_cpu_var(kprobe_ctlblk));
> >               ^
> >
> > vim +332 include/linux/kprobes.h
> >
> > ef53d9c5e Srinivasa D S              2008-07-25  316  void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags);
> > b94cce926 Hien Nguyen                2005-06-23  317  struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
> > ^1da177e4 Linus Torvalds             2005-04-16  318
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  319  /* kprobe_running() will just return the current_kprobe on this CPU */
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  320  static inline struct kprobe *kprobe_running(void)
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  321  {
> > b76834bc1 Christoph Lameter          2010-12-06  322  	return (__this_cpu_read(current_kprobe));
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  323  }
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  324
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  325  static inline void reset_current_kprobe(void)
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  326  {
> > b76834bc1 Christoph Lameter          2010-12-06  327  	__this_cpu_write(current_kprobe, NULL);
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  328  }
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  329
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  330  static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  331  {
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07 @332  	return (&__get_cpu_var(kprobe_ctlblk));
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  333  }
> > e65845235 Ananth N Mavinakayanahalli 2005-11-07  334
> > ^1da177e4 Linus Torvalds             2005-04-16  335  int register_kprobe(struct kprobe *p);
> > ^1da177e4 Linus Torvalds             2005-04-16  336  void unregister_kprobe(struct kprobe *p);
> > 9861668f7 Masami Hiramatsu           2008-04-28  337  int register_kprobes(struct kprobe **kps, int num);
> > 9861668f7 Masami Hiramatsu           2008-04-28  338  void unregister_kprobes(struct kprobe **kps, int num);
> > ^1da177e4 Linus Torvalds             2005-04-16  339  int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
> > ^1da177e4 Linus Torvalds             2005-04-16  340  int longjmp_break_handler(struct kprobe *, struct pt_regs *);
> >
> > :::::: The code at line 332 was first introduced by commit
> > :::::: e65845235c8120be63001fc1a4ac00c819194bbe [PATCH] Kprobes: Track kprobe on a per_cpu basis - base changes
> >
> > :::::: TO: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
> > :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxx>
> >
> > ---
> > 0-DAY kernel test infrastructure                Open Source Technology Center
> > https://lists.01.org/pipermail/kbuild-all                   Intel Corporation