netdev - Re: [net-next:master 6/12] include/linux/usb/cdc.h:23: error: redefinition of 'struct usb_cdc_parsed

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Date:	Wed, 16 Sep 2015 21:06:58 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	David Miller <davem@...emloft.net>
Cc:	oneukum@...e.com, kbuild-all@...org, netdev@...r.kernel.org
Subject: Re: [net-next:master 6/12] include/linux/usb/cdc.h:23: error:
 redefinition of 'struct usb_cdc_parsed_header'

On Tue, Sep 15, 2015 at 01:27:42PM -0700, David Miller wrote:
> From: kbuild test robot <fengguang.wu@...el.com>
> Date: Wed, 16 Sep 2015 03:57:11 +0800
> 
> > All error/warnings (new ones prefixed by >>):
> > 
> >    In file included from drivers/usb/gadget/function/u_ether.h:20,
> >                     from drivers/usb/gadget/legacy/cdc2.c:16:
> >    include/linux/usb/cdc.h:47: warning: 'struct usb_interface' declared inside parameter list
> >    include/linux/usb/cdc.h:47: warning: its scope is only this definition or declaration, which is probably not what you want
> >    In file included from drivers/usb/gadget/function/u_serial.h:16,
> >                     from drivers/usb/gadget/legacy/cdc2.c:17:
> >>> include/linux/usb/cdc.h:23: error: redefinition of 'struct usb_cdc_parsed_header'
> >    include/linux/usb/cdc.h:47: warning: 'struct usb_interface' declared inside parameter list
> >>> include/linux/usb/cdc.h:47: error: conflicting types for 'cdc_parse_cdc_header'
> >    include/linux/usb/cdc.h:47: error: previous declaration of 'cdc_parse_cdc_header' was here
> 
> This may be a side effect of the initial warning, does this reproduce with
> that fixed?  Please show me what the warning looks like in that case.

Dave, net-next/master commit ad1e7b97b3 ("cdc: Fix build warning.")
still has errors.

The problem is, the header file <linux/usb/cdc.h> is included twice.

recent_errors
├── arm-arm5
│   ├── include-linux-usb-cdc.h:error:conflicting-types-for-cdc_parse_cdc_header
│   └── include-linux-usb-cdc.h:error:redefinition-of-struct-usb_cdc_parsed_header
├── arm-arm67
│   ├── include-linux-usb-cdc.h:error:conflicting-types-for-cdc_parse_cdc_header
│   └── include-linux-usb-cdc.h:error:redefinition-of-struct-usb_cdc_parsed_header
├── arm-mmp
│   ├── include-linux-usb-cdc.h:error:conflicting-types-for-cdc_parse_cdc_header
│   └── include-linux-usb-cdc.h:error:redefinition-of-struct-usb_cdc_parsed_header
├── arm-omap2plus_defconfig
│   ├── include-linux-usb-cdc.h:error:conflicting-types-for-cdc_parse_cdc_header
│   └── include-linux-usb-cdc.h:error:redefinition-of-struct-usb_cdc_parsed_header
├── avr32-atngw100_defconfig
│   └── include-linux-usb-cdc.h:error:redefinition-of-struct-usb_cdc_parsed_header
├── avr32-atstk1006_defconfig
│   └── include-linux-usb-cdc.h:error:redefinition-of-struct-usb_cdc_parsed_header
└── i386-allmodconfig
    ├── include-linux-usb-cdc.h:error:conflicting-types-for-cdc_parse_cdc_header
    └── include-linux-usb-cdc.h:error:redefinition-of-struct-usb_cdc_parsed_header

The error messages are now:

In file included from drivers/usb/gadget/function/u_ether.h:20:0,
                 from drivers/usb/gadget/function/f_ncm.c:26:
include/linux/usb/cdc.h:23:8: error: redefinition of 'struct usb_cdc_parsed_header'
 struct usb_cdc_parsed_header {
        ^
In file included from drivers/usb/gadget/function/f_ncm.c:24:0:
include/linux/usb/cdc.h:23:8: note: originally defined here
 struct usb_cdc_parsed_header {
        ^
In file included from drivers/usb/gadget/function/u_ether.h:20:0,
                 from drivers/usb/gadget/function/f_ncm.c:26:
include/linux/usb/cdc.h:44:5: error: conflicting types for 'cdc_parse_cdc_header'
 int cdc_parse_cdc_header(struct usb_cdc_parsed_header *hdr,
     ^
In file included from drivers/usb/gadget/function/f_ncm.c:24:0:
include/linux/usb/cdc.h:44:5: note: previous declaration of 'cdc_parse_cdc_header' was here
 int cdc_parse_cdc_header(struct usb_cdc_parsed_header *hdr,
     ^

Thanks,
Fengguang
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