linux-kernel - RE: [PATCH] dax/hmem: build hmem device support as module if possible

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Date:   Tue, 14 Feb 2023 08:39:40 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Dave Jiang" <dave.jiang@...el.com>
CC:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] dax/hmem: build hmem device support as module if possible

Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When device_hmem.o is enabled but dax itself is a loadable module, the
> dax_hmem support fails to link because Kbuild never compiles built-in
> code under drivers/dax:
> 
> ERROR: modpost: "walk_hmem_resources" [drivers/dax/hmem/dax_hmem.ko] undefined!
> 
> Make sure that drivers/dax is entered for compiling built-in code
> even with CONFIG_DAX=m.
> 
> Fixes: 7dab174e2e27 ("dax/hmem: Move hmem device registration to dax_hmem.ko")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Thanks, applied.