linux-kernel - Re: [PATCH 1/2] USB: constify usb_mon

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Date:	Sat, 28 Nov 2015 22:59:23 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	kbuild-all@...org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	kernel-janitors@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] USB: constify usb_mon_operations structure

Hi Julia,

[auto build test ERROR on: v4.4-rc2]
[also build test ERROR on: next-20151127]

url:    https://github.com/0day-ci/linux/commits/Julia-Lawall/USB-constify-usb_mon_operations-structure/20151128-223726
config: xtensa-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
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

Note: the linux-review/Julia-Lawall/USB-constify-usb_mon_operations-structure/20151128-223726 HEAD 97f842222711238f9fbca0d4cf79fcec2f31ed33 builds fine.
      It only hurts bisectibility.

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

>> drivers/usb/core/hcd.c:3003:28: error: conflicting types for 'mon_ops'
    struct usb_mon_operations *mon_ops;
                               ^
   In file included from drivers/usb/core/hcd.c:47:0:
   include/linux/usb/hcd.h:663:41: note: previous declaration of 'mon_ops' was here
    extern const struct usb_mon_operations *mon_ops;
                                            ^
>> drivers/usb/core/hcd.c:3013:5: error: conflicting types for 'usb_mon_register'
    int usb_mon_register (struct usb_mon_operations *ops)
        ^
   In file included from drivers/usb/core/hcd.c:47:0:
   include/linux/usb/hcd.h:685:5: note: previous declaration of 'usb_mon_register' was here
    int usb_mon_register(const struct usb_mon_operations *ops);
        ^
   In file included from include/linux/linkage.h:6:0,
                    from include/linux/kernel.h:6,
                    from include/linux/list.h:8,
                    from include/linux/module.h:9,
                    from drivers/usb/core/hcd.c:26:
   drivers/usb/core/hcd.c:3023:20: error: conflicting types for 'usb_mon_register'
    EXPORT_SYMBOL_GPL (usb_mon_register);
                       ^
   include/linux/export.h:57:21: note: in definition of macro '__EXPORT_SYMBOL'
     extern typeof(sym) sym;     \
                        ^
>> drivers/usb/core/hcd.c:3023:1: note: in expansion of macro 'EXPORT_SYMBOL_GPL'
    EXPORT_SYMBOL_GPL (usb_mon_register);
    ^
   In file included from drivers/usb/core/hcd.c:47:0:
   include/linux/usb/hcd.h:685:5: note: previous declaration of 'usb_mon_register' was here
    int usb_mon_register(const struct usb_mon_operations *ops);
        ^

vim +/mon_ops +3003 drivers/usb/core/hcd.c

782e70c6 Greg Kroah-Hartman 2008-01-25  2997  EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
64a21d02 Aleksey Gorelov    2006-08-08  2998  
^1da177e Linus Torvalds     2005-04-16  2999  /*-------------------------------------------------------------------------*/
^1da177e Linus Torvalds     2005-04-16  3000  
f150fa1a Pete Zaitcev       2008-11-13  3001  #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
^1da177e Linus Torvalds     2005-04-16  3002  
^1da177e Linus Torvalds     2005-04-16 @3003  struct usb_mon_operations *mon_ops;
^1da177e Linus Torvalds     2005-04-16  3004  
^1da177e Linus Torvalds     2005-04-16  3005  /*
^1da177e Linus Torvalds     2005-04-16  3006   * The registration is unlocked.
^1da177e Linus Torvalds     2005-04-16  3007   * We do it this way because we do not want to lock in hot paths.
^1da177e Linus Torvalds     2005-04-16  3008   *
^1da177e Linus Torvalds     2005-04-16  3009   * Notice that the code is minimally error-proof. Because usbmon needs
^1da177e Linus Torvalds     2005-04-16  3010   * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
^1da177e Linus Torvalds     2005-04-16  3011   */
^1da177e Linus Torvalds     2005-04-16  3012  
^1da177e Linus Torvalds     2005-04-16 @3013  int usb_mon_register (struct usb_mon_operations *ops)
^1da177e Linus Torvalds     2005-04-16  3014  {
^1da177e Linus Torvalds     2005-04-16  3015  
^1da177e Linus Torvalds     2005-04-16  3016  	if (mon_ops)
^1da177e Linus Torvalds     2005-04-16  3017  		return -EBUSY;
^1da177e Linus Torvalds     2005-04-16  3018  
^1da177e Linus Torvalds     2005-04-16  3019  	mon_ops = ops;
^1da177e Linus Torvalds     2005-04-16  3020  	mb();
^1da177e Linus Torvalds     2005-04-16  3021  	return 0;
^1da177e Linus Torvalds     2005-04-16  3022  }
^1da177e Linus Torvalds     2005-04-16 @3023  EXPORT_SYMBOL_GPL (usb_mon_register);
^1da177e Linus Torvalds     2005-04-16  3024  
^1da177e Linus Torvalds     2005-04-16  3025  void usb_mon_deregister (void)
^1da177e Linus Torvalds     2005-04-16  3026  {

:::::: The code at line 3003 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>

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