linux-kernel - Re: [PATCH] bcm47xx: fix build regression

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Date:   Wed, 31 May 2017 11:43:36 +0200
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Rafał Miłecki <zajec5@...il.com>
Cc:     Brian Norris <computersforpeace@...il.com>,
        linux-mtd@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH] bcm47xx: fix build regression

On 5/30/2017 1:20 PM, Arnd Bergmann wrote:
> An unknown change in the kernel headers caused a build regression
> in an MTD partition driver:
> 
> In file included from drivers/mtd/bcm47xxpart.c:12:0:
> include/linux/bcm47xx_nvram.h: In function 'bcm47xx_nvram_init_from_mem':
> include/linux/bcm47xx_nvram.h:27:10: error: 'ENOTSUPP' undeclared (first use in this function)
> 
> Clearly we want to include linux/errno.h here.

unfortunate that you did not find the commit that caused this build 
regression. You could produce preprocessor output when it was working to 
see where errno.h got implicitly included and start looking there for 
git history.

Regards,
Arend

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   include/linux/bcm47xx_nvram.h | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/include/linux/bcm47xx_nvram.h b/include/linux/bcm47xx_nvram.h
> index 2793652fbf66..a414a2b53e41 100644
> --- a/include/linux/bcm47xx_nvram.h
> +++ b/include/linux/bcm47xx_nvram.h
> @@ -8,6 +8,7 @@
>   #ifndef __BCM47XX_NVRAM_H
>   #define __BCM47XX_NVRAM_H
>   
> +#include <linux/errno.h>
>   #include <linux/types.h>
>   #include <linux/kernel.h>
>   #include <linux/vmalloc.h>
>