linux-kernel - Re: [PATCH] [v2] sbitmap, scsi/target: add seq

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Date:   Fri, 6 Jul 2018 20:33:55 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "arnd@...db.de" <arnd@...db.de>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "paolo.valente@...aro.org" <paolo.valente@...aro.org>,
        "ming.lei@...hat.com" <ming.lei@...hat.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "osandov@...com" <osandov@...com>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>
Subject: Re: [PATCH] [v2] sbitmap, scsi/target: add seq_file forward
 declaration

On Fri, 2018-07-06 at 22:19 +0200, Arnd Bergmann wrote:
> The target core runs into a warning in the linux/sbitmap.h
> file in some configurations:
> 
> In file included from include/target/target_core_base.h:7,
>                  from drivers/target/target_core_fabric_lib.c:41:
> include/linux/sbitmap.h:331:46: error: 'struct seq_file' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
>  void sbitmap_show(struct sbitmap *sb, struct seq_file *m);
>                                               ^~~~~~~~
> 
> In general, headers should not depend on others being included first,
> so this fixes it with a forward declaration for that struct name, but
> we probably want to merge the patch through the scsi tree to help
> bisection.
> 
> Fixes: 10e9cbb6b531 ("scsi: target: Convert target drivers to use sbitmap")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> v2: move declaration to the start of the header, as suggested by Bart
> ---
>  include/linux/sbitmap.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/sbitmap.h b/include/linux/sbitmap.h
> index e6539536dea9..804a50983ec5 100644
> --- a/include/linux/sbitmap.h
> +++ b/include/linux/sbitmap.h
> @@ -23,6 +23,8 @@
>  #include <linux/kernel.h>
>  #include <linux/slab.h>
>  
> +struct seq_file;
> +
>  /**
>   * struct sbitmap_word - Word in a &struct sbitmap.
>   */

Reviewed-by: Bart Van Assche <bart.vanassche@....com>