linux-kernel - Re: [mtd:spi-mem-ecc 30/30] ld.lld: error: undefined symbol: nand_ecc_unregister_on_host_hw

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Date:   Wed, 2 Feb 2022 16:34:52 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [mtd:spi-mem-ecc 30/30] ld.lld: error: undefined symbol:
 nand_ecc_unregister_on_host_hw_engine


broonie@...nel.org wrote on Wed, 2 Feb 2022 15:20:05 +0000:

> On Wed, Feb 02, 2022 at 03:45:04PM +0100, Miquel Raynal wrote:
> 
> > I've failed to prevent faulty configurations with regular depends
> > on/select keywords, so I've come with a new solution which received a
> > successful build coverage test from the 0-day robots.  
> 
> > In order to still be able to use the spi controller driver (=y) while
> > mtd is =m or =n, I need to add an IS_REACHABLE() check in a couple of
> > headers. This way we can just imply the right MTD symbols from the
> > SPI_MXIC Kconfig entry.  
> 
> Isn't this just a case where we shouldn't allow MTD to be built modular?

How would you do that in a nice Kconfig way?