linux-kernel - [RFC PATCH 06/20] dev_dax_iomap: Add CONFIG_DEV_DAX

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Date: Fri, 23 Feb 2024 11:41:50 -0600
From: John Groves <John@...ves.net>
To: John Groves <jgroves@...ron.com>,
	Jonathan Corbet <corbet@....net>,
	Dan Williams <dan.j.williams@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Matthew Wilcox <willy@...radead.org>,
	linux-cxl@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	nvdimm@...ts.linux.dev
Cc: John@...ves.net,
	john@...alactic.com,
	Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	dave.hansen@...ux.intel.com,
	gregory.price@...verge.com,
	John Groves <john@...ves.net>
Subject: [RFC PATCH 06/20] dev_dax_iomap: Add CONFIG_DEV_DAX_IOMAP kernel build parameter

Add the CONFIG_DEV_DAX_IOMAP kernel config parameter to control building
of the iomap functionality to support fsdax on devdax.

Signed-off-by: John Groves <john@...ves.net>
---
 drivers/dax/Kconfig | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/dax/Kconfig b/drivers/dax/Kconfig
index a88744244149..b1ebcc77120b 100644
--- a/drivers/dax/Kconfig
+++ b/drivers/dax/Kconfig
@@ -78,4 +78,10 @@ config DEV_DAX_KMEM
 
 	  Say N if unsure.
 
+config DEV_DAX_IOMAP
+       depends on DEV_DAX && DAX
+       def_bool y
+       help
+         Support iomap mapping of devdax devices (for FS-DAX file
+         systems that reside on character /dev/dax devices)
 endif
-- 
2.43.0