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

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Date:   Mon, 12 Sep 2016 09:04:07 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     ananth@...ibm.com
cc:     kbuild test robot <fengguang.wu@...el.com>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        naohiro.aota@...t.com
Subject: Re: include/linux/kprobes.h:332:2: error: invalid use of undefined
 type 'struct kprobe_ctlblk'

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@...ibm.com>
> :::::: CC: Linus Torvalds <torvalds@...osdl.org>
>
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
>
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