linux-kernel - Re: [PATCH] mtd: rawnand: omap2: Prevent invalid configuration and build error

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Date:   Sat, 19 Feb 2022 07:08:36 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Roger Quadros <rogerq@...nel.org>
Cc:     miquel.raynal@...tlin.com, krzysztof.kozlowski@...onical.com,
        vigneshr@...com, nm@...com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: rawnand: omap2: Prevent invalid configuration and
 build error

On Tue, Jan 18, 2022 at 02:35:25PM +0200, Roger Quadros wrote:
> We need to select MEMORY as well otherwise OMAP_GPMC will not be built.
> For simplicity let's select MEMORY and OMAP_GPMC unconditionally as
> this driver depends on OMAP_GPMC driver and uses symbols from there.
> 
> Fixes: dbcb124acebd ("mtd: rawnand: omap2: Select GPMC device driver for ARCH_K3")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Roger Quadros <rogerq@...nel.org>

This patch ignores OMAP_GPMC dependencies and results in:

WARNING: unmet direct dependencies detected for OMAP_GPMC
  Depends on [n]: MEMORY [=y] && OF_ADDRESS [=n]
  Selected by [m]:
  - MTD_NAND_OMAP2 [=m] && MTD [=m] && MTD_RAW_NAND [=m] && (ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST [=y]) && HAS_IOMEM [=y]

when configuring sparc64:allmodconfig, and in the following
build failure when trying to build that image.

Building sparc64:allmodconfig ... failed
--------------
Error log:
<stdin>:1517:2: warning: #warning syscall clone3 not implemented [-Wcpp]
sparc64-linux-ld: drivers/memory/omap-gpmc.o: in function `gpmc_probe_generic_child':
omap-gpmc.c:(.text.unlikely+0x14c4): undefined reference to `of_platform_device_create'

Guenter

> ---
>  drivers/mtd/nand/raw/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
> index 20408b7db540..d986ab4e4c35 100644
> --- a/drivers/mtd/nand/raw/Kconfig
> +++ b/drivers/mtd/nand/raw/Kconfig
> @@ -42,7 +42,8 @@ config MTD_NAND_OMAP2
>  	tristate "OMAP2, OMAP3, OMAP4 and Keystone NAND controller"
>  	depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST
>  	depends on HAS_IOMEM
> -	select OMAP_GPMC if ARCH_K3
> +	select MEMORY
> +	select OMAP_GPMC
>  	help
>  	  Support for NAND flash on Texas Instruments OMAP2, OMAP3, OMAP4
>  	  and Keystone platforms.
> -- 
> 2.17.1
>