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Date:   Wed, 10 Apr 2019 15:58:56 +0200
From:   Boris Brezillon <boris.brezillon@collabora.com>
To:     Yue Haibing <yuehaibing@huawei.com>
Cc:     <miquel.raynal@bootlin.com>, <richard@nod.at>,
        <computersforpeace@gmail.com>, <marek.vasut@gmail.com>,
        <paul.burton@mips.com>, <bbrezillon@kernel.org>,
        <linux-kernel@vger.kernel.org>, <linux-mtd@lists.infradead.org>
Subject: Re: [PATCH] mtd: nand: Fix build error while
 CONFIG_MTD_NAND_ECC_SW_BCH is set to module
Message-ID: <20190410155856.655122c8@collabora.com>
In-Reply-To: <20190410153920.68267a1a@collabora.com>
References: <20190410130747.35692-1-yuehaibing@huawei.com>
        <20190410153920.68267a1a@collabora.com>
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On Wed, 10 Apr 2019 15:39:28 +0200
Boris Brezillon <boris.brezillon@collabora.com> wrote:

> On Wed, 10 Apr 2019 21:07:47 +0800
> Yue Haibing <yuehaibing@huawei.com> wrote:
> 
> > From: YueHaibing <yuehaibing@huawei.com>
> > 
> > Fix gcc build error while CONFIG_MTD_NAND_ECC_SW_BCH
> > is set to module:
> > 
> > drivers/mtd/nand/raw/nand_base.o: In function `nand_cleanup':
> > (.text+0xef6): undefined reference to `nand_bch_free'
> > drivers/mtd/nand/raw/nand_base.o: In function `nand_scan_tail':
> > nand_base.c:(.text+0xa101): undefined reference to `nand_bch_calculate_ecc'
> > nand_base.c:(.text+0xa120): undefined reference to `nand_bch_correct_data'
> > nand_base.c:(.text+0xa269): undefined reference to `nand_bch_init'
> > 
> > CONFIG_MTD_NAND_ECC_SW_BCH should not be set to M,
> > because MTD_RAW_NAND need it while linked.
> > 
> > Reported-by: Hulk Robot <hulkci@huawei.com>
> > Fixes: 193bd4002644 ("mtd: nand: add software BCH ECC support"  
> 
> Nope, it's not this one that introduced the regression.
> 
> 
> 
> > Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> > ---
> >  drivers/mtd/nand/raw/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
> > index 615d738..0500c42 100644
> > --- a/drivers/mtd/nand/raw/Kconfig
> > +++ b/drivers/mtd/nand/raw/Kconfig
> > @@ -22,7 +22,7 @@ menuconfig MTD_RAW_NAND
> >  if MTD_RAW_NAND
> >  
> >  config MTD_NAND_ECC_SW_BCH
> > -	tristate "Support software BCH ECC"
> > +	bool "Support software BCH ECC"
> >  	select BCH
> >  	default n
> >  	help  
> 
> Should be fixed with the following diff squashed into:
> 
> 51ef1d0b2095 ("mtd: nand: Clarify Kconfig entry for software BCH ECC algorithm")
> 
> --->8---  
> diff --git a/include/linux/mtd/nand_bch.h b/include/linux/mtd/nand_bch.h
> index b8106651f807..06ce2b655c13 100644
> --- a/include/linux/mtd/nand_bch.h
> +++ b/include/linux/mtd/nand_bch.h
> @@ -15,7 +15,7 @@ struct mtd_info;
>  struct nand_chip;
>  struct nand_bch_control;
>  
> -#if defined(CONFIG_MTD_NAND_ECC_BCH)
> +#if defined(CONFIG_MTD_NAND_ECC_SW_BCH)
>  
>  static inline int mtd_nand_has_bch(void) { return 1; }
>  
> @@ -39,7 +39,7 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd);
>   */
>  void nand_bch_free(struct nand_bch_control *nbc);
>  
> -#else /* !CONFIG_MTD_NAND_ECC_BCH */
> +#else /* !CONFIG_MTD_NAND_ECC_SW_BCH */
>  
>  static inline int mtd_nand_has_bch(void) { return 0; }
>  
> @@ -64,6 +64,6 @@ static inline struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
>  
>  static inline void nand_bch_free(struct nand_bch_control *nbc) {}
>  
> -#endif /* CONFIG_MTD_NAND_ECC_BCH */
> +#endif /* CONFIG_MTD_NAND_ECC_SW_BCH */
>  
>  #endif /* __MTD_NAND_BCH_H__ */

Sorry, I didn't look at the right branch, this part of the code was
correct, but we still have a problem to express the RAW_NAND(y) ->
SW_BCH(y) dependency.