linux-kernel - Re: [PATCH] Fix blkdev.h build errors when BLOCK=n

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Message-ID: <20120512195430.GA23863@n2100.arm.linux.org.uk>
Date:	Sat, 12 May 2012 20:54:30 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH] Fix blkdev.h build errors when BLOCK=n

Ping.

On Mon, Apr 30, 2012 at 09:18:34AM +0100, Russell King - ARM Linux wrote:
> I see builds failing with:
> 
>   CC [M]  drivers/mmc/host/dw_mmc.o
> In file included from drivers/mmc/host/dw_mmc.c:15:
> include/linux/blkdev.h:1404: warning: 'struct task_struct' declared inside parameter list
> include/linux/blkdev.h:1404: warning: its scope is only this definition or declaration, which is probably not what you want
> include/linux/blkdev.h:1408: warning: 'struct task_struct' declared inside parameter list
> include/linux/blkdev.h:1413: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'blk_needs_flush_plug'
> make[4]: *** [drivers/mmc/host/dw_mmc.o] Error 1
> 
> This is because dw_mmc.c includes linux/blkdev.h as the very first file,
> and when CONFIG_BLOCK=n, blkdev.h omits all includes.
> 
> As it requires linux/sched.h even when CONFIG_BLOCK=n, move this out of
> the #ifdef.
> 
> Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
> ---
>  include/linux/blkdev.h |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 2aa2466..4d4ac24 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -1,9 +1,10 @@
>  #ifndef _LINUX_BLKDEV_H
>  #define _LINUX_BLKDEV_H
>  
> +#include <linux/sched.h>
> +
>  #ifdef CONFIG_BLOCK
>  
> -#include <linux/sched.h>
>  #include <linux/major.h>
>  #include <linux/genhd.h>
>  #include <linux/list.h>
> 
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