linux-kernel - Re: [PATCH 1/2] ARM: omap1: add nand

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Date:   Wed, 26 Sep 2018 15:23:40 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Boris Brezillon <boris.brezillon@...tlin.com>,
        linux-mtd@...ts.infradead.org,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Tony Lindgren <tony@...mide.com>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ARM: omap1: add nand_chip declaration

Hi Arnd,

Thanks for the fix, sorry for breaking the build.

Arnd Bergmann <arnd@...db.de> wrote on Wed, 26 Sep 2018 15:04:38 +0200:

> Recent MTD changes caused a minor build regression on OMAP1:
> 
> In file included from arch/arm/mach-omap1/devices.c:31:
> arch/arm/mach-omap1/common.h:85:39: error: 'struct nand_chip' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
> 
> Fixes: 1002aed789bc ("mtd: rawnand: plat_nand: Pass a nand_chip object to all platform_nand_ctrl hooks")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm/mach-omap1/common.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mach-omap1/common.h b/arch/arm/mach-omap1/common.h
> index 11b87a4c84d4..82f2c065040a 100644
> --- a/arch/arm/mach-omap1/common.h
> +++ b/arch/arm/mach-omap1/common.h
> @@ -82,6 +82,7 @@ void omap1_restart(enum reboot_mode, const char *);
>  
>  extern void __init omap_check_revision(void);
>  
> +struct nand_chip;
>  extern void omap1_nand_cmd_ctl(struct nand_chip *this, int cmd,
>  			       unsigned int ctrl);
>  

Currently I see "#include <linux/mtd/mtd.h>" at the top of this file.
That's where the "struct mtd_info" that has been replaced by a "struct
nand_chip" was declared. The nand_chip object is declared in
<linux/mtd/rawnand.h>.

I think you can remove this include (unneeded anymore for what I see).
Then, either you keep the nand_chip forward declaration, or replace the
mtd.h include into the rawnand.h one?


Thanks,
Miquèl