linux-kernel - [PATCH 5.1 043/128] drivers/dax: Allow to include DEV_DAX

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Date:   Mon, 20 May 2019 14:13:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH 5.1 043/128] drivers/dax: Allow to include DEV_DAX_PMEM as builtin

From: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>

commit 67476656febd7ec5f1fe1aeec3c441fcf53b1e45 upstream.

This move the dependency to DEV_DAX_PMEM_COMPAT such that only
if DEV_DAX_PMEM is built as module we can allow the compat support.

This allows to test the new code easily in a emulation setup where we
often build things without module support.

Cc: <stable@...r.kernel.org>
Fixes: 730926c3b099 ("device-dax: Add /sys/class/dax backwards compatibility")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dax/Kconfig |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/dax/Kconfig
+++ b/drivers/dax/Kconfig
@@ -23,7 +23,6 @@ config DEV_DAX
 config DEV_DAX_PMEM
 	tristate "PMEM DAX: direct access to persistent memory"
 	depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX
-	depends on m # until we can kill DEV_DAX_PMEM_COMPAT
 	default DEV_DAX
 	help
 	  Support raw access to persistent memory.  Note that this
@@ -50,7 +49,7 @@ config DEV_DAX_KMEM
 
 config DEV_DAX_PMEM_COMPAT
 	tristate "PMEM DAX: support the deprecated /sys/class/dax interface"
-	depends on DEV_DAX_PMEM
+	depends on m && DEV_DAX_PMEM=m
 	default DEV_DAX_PMEM
 	help
 	  Older versions of the libdaxctl library expect to find all