From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mslow1.mail.gandi.net (mslow1.mail.gandi.net [217.70.178.240])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8A3B92F2B
	for <llvm@lists.linux.dev>; Wed,  2 Feb 2022 15:50:50 +0000 (UTC)
Received: from relay11.mail.gandi.net (unknown [217.70.178.231])
	by mslow1.mail.gandi.net (Postfix) with ESMTP id CC53DD29CC
	for <llvm@lists.linux.dev>; Wed,  2 Feb 2022 15:35:02 +0000 (UTC)
Received: (Authenticated sender: miquel.raynal@bootlin.com)
	by mail.gandi.net (Postfix) with ESMTPSA id E298410000A;
	Wed,  2 Feb 2022 15:34:53 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1;
	t=1643816095;
	h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
	 to:to:cc:cc:mime-version:mime-version:content-type:content-type:
	 content-transfer-encoding:content-transfer-encoding:
	 in-reply-to:in-reply-to:references:references;
	bh=udh0XHWQaOuEVGcPinmtV33kWRGTQJdx9kgSeb7ptEA=;
	b=TANoPNZIlK9r9D4RAA6u4ohMIJi2bQzFP5OjFcV7SWY0g1o94ix/w1URlsTW3IJp2TSbol
	JSKRQDtH4fHVudiBCo8FKdrTJS7+tHHdel0nHhRIeAeLxuCJ6daNOu8JLdwoudsk9qwU1u
	uCCUTiTx42KqS21ONHO3XLNeOYRmbdgmGLNIpbUVuUWtMMkLgzLw4cQLmOD+5Kabm+BwR2
	nZOhcjfcf1JlVjarU/n4C8MWoce6Aj+0rI4SMIqHzomoTxcD+UFfmMFuEoSB7ZI5MC/xbW
	+x8sXaAGX4a5x4cCE+0yDGI5As0z7J05bOUMFvTipKN5n1HLsPNR9m59eK8+oA==
Date: Wed, 2 Feb 2022 16:34:52 +0100
From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Mark Brown <broonie@kernel.org>
Cc: kernel test robot <lkp@intel.com>, llvm@lists.linux.dev,
 kbuild-all@lists.01.org, linux-kernel@vger.kernel.org
Subject: Re: [mtd:spi-mem-ecc 30/30] ld.lld: error: undefined symbol:
 nand_ecc_unregister_on_host_hw_engine
Message-ID: <20220202163452.746d50ca@xps13>
In-Reply-To: <YfqhJZ+BzfMrpN4Y@sirena.org.uk>
References: <202202011308.a6RlPiGp-lkp@intel.com>
	<20220202154504.7737deed@xps13>
	<YfqhJZ+BzfMrpN4Y@sirena.org.uk>
Organization: Bootlin
X-Mailer: Claws Mail 3.17.7 (GTK+ 2.24.32; x86_64-pc-linux-gnu)
Precedence: bulk
X-Mailing-List: llvm@lists.linux.dev
List-Id: <llvm.lists.linux.dev>
List-Subscribe: <mailto:llvm+subscribe@lists.linux.dev>
List-Unsubscribe: <mailto:llvm+unsubscribe@lists.linux.dev>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit


broonie@kernel.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?