linux-kernel - RE: [PATCH] dax: clx: add CXL

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Date:   Tue, 14 Feb 2023 08:38:07 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
CC:     Arnd Bergmann <arnd@...db.de>,
        Gregory Price <gregory.price@...verge.com>,
        John Ogness <john.ogness@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>, <nvdimm@...ts.linux.dev>,
        <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] dax: clx: add CXL_REGION dependency

Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> There is already a dependency on CXL_REGION, which depends on CXL_BUS,
> but since CXL_REGION is a 'bool' symbol, it's possible to configure
> DAX as built-in even though CXL itself is a loadable module:
> 
> x86_64-linux-ld: drivers/dax/cxl.o: in function `cxl_dax_region_probe':
> cxl.c:(.text+0xb): undefined reference to `to_cxl_dax_region'
> x86_64-linux-ld: drivers/dax/cxl.o: in function `cxl_dax_region_driver_init':
> cxl.c:(.init.text+0x10): undefined reference to `__cxl_driver_register'
> x86_64-linux-ld: drivers/dax/cxl.o: in function `cxl_dax_region_driver_exit':
> cxl.c:(.exit.text+0x9): undefined reference to `cxl_driver_unregister'
> 
> Prevent this with another depndency on the tristate symbol.
> 
> Fixes: 09d09e04d2fc ("cxl/dax: Create dax devices for CXL RAM regions")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Looks good, thanks Arnd.