In preparation for switching to the core device_lock lockdep validation
scheme, convert nd_device_lock() calls back to device_lock().
Note that this temporarily reverts the code back to the typical no
validation of device_lock() until a follow-on patch to set
dev->lock_class.
Cc: Vishal Verma <[email protected]>
Cc: Dave Jiang <[email protected]>
Cc: Ira Weiny <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
---
drivers/nvdimm/btt_devs.c | 16 ++++++++--------
drivers/nvdimm/bus.c | 23 +++++++++-------------
drivers/nvdimm/core.c | 10 +++++-----
drivers/nvdimm/dimm_devs.c | 8 ++++----
drivers/nvdimm/namespace_devs.c | 36 ++++++++++++++++++-----------------
drivers/nvdimm/nd-core.h | 40 ---------------------------------------
drivers/nvdimm/pfn_devs.c | 24 ++++++++++++-----------
drivers/nvdimm/pmem.c | 2 +-
drivers/nvdimm/region.c | 2 +-
drivers/nvdimm/region_devs.c | 16 ++++++++--------
lib/Kconfig.debug | 3 ++-
11 files changed, 68 insertions(+), 112 deletions(-)
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index e5a58520d398..60c19b988bc4 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -50,14 +50,14 @@ static ssize_t sector_size_store(struct device *dev,
struct nd_btt *nd_btt = to_nd_btt(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_size_select_store(dev, buf, &nd_btt->lbasize,
btt_lbasize_supported);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc ? rc : len;
}
@@ -79,11 +79,11 @@ static ssize_t uuid_store(struct device *dev,
struct nd_btt *nd_btt = to_nd_btt(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc ? rc : len;
}
@@ -108,13 +108,13 @@ static ssize_t namespace_store(struct device *dev,
struct nd_btt *nd_btt = to_nd_btt(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
@@ -126,14 +126,14 @@ static ssize_t size_show(struct device *dev,
struct nd_btt *nd_btt = to_nd_btt(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
if (dev->driver)
rc = sprintf(buf, "%llu\n", nd_btt->size);
else {
/* no size to convey if the btt instance is disabled */
rc = -ENXIO;
}
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 7b0d1443217a..b5a1317c30dd 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -88,9 +88,7 @@ static int nvdimm_bus_probe(struct device *dev)
dev->driver->name, dev_name(dev));
nvdimm_bus_probe_start(nvdimm_bus);
- debug_nvdimm_lock(dev);
rc = nd_drv->probe(dev);
- debug_nvdimm_unlock(dev);
if ((rc == 0 || rc == -EOPNOTSUPP) &&
dev->parent && is_nd_region(dev->parent))
@@ -111,11 +109,8 @@ static void nvdimm_bus_remove(struct device *dev)
struct module *provider = to_bus_provider(dev);
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
- if (nd_drv->remove) {
- debug_nvdimm_lock(dev);
+ if (nd_drv->remove)
nd_drv->remove(dev);
- debug_nvdimm_unlock(dev);
- }
dev_dbg(&nvdimm_bus->dev, "%s.remove(%s)\n", dev->driver->name,
dev_name(dev));
@@ -139,7 +134,7 @@ static void nvdimm_bus_shutdown(struct device *dev)
void nd_device_notify(struct device *dev, enum nvdimm_event event)
{
- nd_device_lock(dev);
+ device_lock(dev);
if (dev->driver) {
struct nd_device_driver *nd_drv;
@@ -147,7 +142,7 @@ void nd_device_notify(struct device *dev, enum nvdimm_event event)
if (nd_drv->notify)
nd_drv->notify(dev, event);
}
- nd_device_unlock(dev);
+ device_unlock(dev);
}
EXPORT_SYMBOL(nd_device_notify);
@@ -572,9 +567,9 @@ void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
* or otherwise let the async path handle it if the
* unregistration was already queued.
*/
- nd_device_lock(dev);
+ device_lock(dev);
killed = kill_device(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
if (!killed)
return;
@@ -930,10 +925,10 @@ void wait_nvdimm_bus_probe_idle(struct device *dev)
if (nvdimm_bus->probe_active == 0)
break;
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
wait_event(nvdimm_bus->wait,
nvdimm_bus->probe_active == 0);
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
} while (true);
}
@@ -1167,7 +1162,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
goto out;
}
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf);
if (rc)
@@ -1189,7 +1184,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
out_unlock:
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
out:
kfree(in_env);
kfree(out_env);
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 69a03358817f..144926b7451c 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -215,7 +215,7 @@ EXPORT_SYMBOL_GPL(to_nvdimm_bus_dev);
*
* Enforce that uuids can only be changed while the device is disabled
* (driver detached)
- * LOCKING: expects nd_device_lock() is held on entry
+ * LOCKING: expects device_lock() is held on entry
*/
int nd_uuid_store(struct device *dev, uuid_t **uuid_out, const char *buf,
size_t len)
@@ -316,15 +316,15 @@ static DEVICE_ATTR_RO(provider);
static int flush_namespaces(struct device *dev, void *data)
{
- nd_device_lock(dev);
- nd_device_unlock(dev);
+ device_lock(dev);
+ device_unlock(dev);
return 0;
}
static int flush_regions_dimms(struct device *dev, void *data)
{
- nd_device_lock(dev);
- nd_device_unlock(dev);
+ device_lock(dev);
+ device_unlock(dev);
device_for_each_child(dev, NULL, flush_namespaces);
return 0;
}
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index ee507eed42b5..93113c0c4dc8 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -341,9 +341,9 @@ static ssize_t available_slots_show(struct device *dev,
{
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
rc = __available_slots_show(dev_get_drvdata(dev), buf);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
@@ -386,12 +386,12 @@ static ssize_t security_store(struct device *dev,
* done while probing is idle and the DIMM is not in active use
* in any region.
*/
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = nvdimm_security_store(dev, buf, len);
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 62b83b2e26e3..bc578dbea472 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -264,7 +264,7 @@ static ssize_t alt_name_store(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev->parent);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __alt_name_store(dev, buf, len);
@@ -272,7 +272,7 @@ static ssize_t alt_name_store(struct device *dev,
rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc < 0 ? rc : len;
}
@@ -846,7 +846,7 @@ static ssize_t size_store(struct device *dev,
if (rc)
return rc;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __size_store(dev, val);
@@ -868,7 +868,7 @@ static ssize_t size_store(struct device *dev,
dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc < 0 ? rc : len;
}
@@ -1043,7 +1043,7 @@ static ssize_t uuid_store(struct device *dev,
} else
return -ENXIO;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
if (to_ndns(dev)->claim)
@@ -1059,7 +1059,7 @@ static ssize_t uuid_store(struct device *dev,
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc < 0 ? rc : len;
}
@@ -1118,7 +1118,7 @@ static ssize_t sector_size_store(struct device *dev,
} else
return -ENXIO;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
if (to_ndns(dev)->claim)
rc = -EBUSY;
@@ -1129,7 +1129,7 @@ static ssize_t sector_size_store(struct device *dev,
dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
buf, buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc ? rc : len;
}
@@ -1239,9 +1239,9 @@ static ssize_t holder_show(struct device *dev,
struct nd_namespace_common *ndns = to_ndns(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
@@ -1278,7 +1278,7 @@ static ssize_t holder_class_store(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev->parent);
int rc;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __holder_class_store(dev, buf);
@@ -1286,7 +1286,7 @@ static ssize_t holder_class_store(struct device *dev,
rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s(%d)\n", rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc < 0 ? rc : len;
}
@@ -1297,7 +1297,7 @@ static ssize_t holder_class_show(struct device *dev,
struct nd_namespace_common *ndns = to_ndns(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
if (ndns->claim_class == NVDIMM_CCLASS_NONE)
rc = sprintf(buf, "\n");
else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
@@ -1309,7 +1309,7 @@ static ssize_t holder_class_show(struct device *dev,
rc = sprintf(buf, "dax\n");
else
rc = sprintf(buf, "<unknown>\n");
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
@@ -1323,7 +1323,7 @@ static ssize_t mode_show(struct device *dev,
char *mode;
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
claim = ndns->claim;
if (claim && is_nd_btt(claim))
mode = "safe";
@@ -1336,7 +1336,7 @@ static ssize_t mode_show(struct device *dev,
else
mode = "raw";
rc = sprintf(buf, "%s\n", mode);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
@@ -1456,8 +1456,8 @@ struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
* Flush any in-progess probes / removals in the driver
* for the raw personality of this namespace.
*/
- nd_device_lock(&ndns->dev);
- nd_device_unlock(&ndns->dev);
+ device_lock(&ndns->dev);
+ device_unlock(&ndns->dev);
if (ndns->dev.driver) {
dev_dbg(&ndns->dev, "is active, can't bind %s\n",
dev_name(dev));
diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h
index deb3d047571e..1668a10e41ba 100644
--- a/drivers/nvdimm/nd-core.h
+++ b/drivers/nvdimm/nd-core.h
@@ -191,45 +191,5 @@ static inline int nvdimm_lock_class(struct device *dev)
else
return -1;
}
-
-static inline void debug_nvdimm_lock(struct device *dev)
-{
- mutex_lock_nested(&dev->lockdep_mutex, nvdimm_lock_class(dev));
-}
-
-static inline void debug_nvdimm_unlock(struct device *dev)
-{
- mutex_unlock(&dev->lockdep_mutex);
-}
-
-static inline void nd_device_lock(struct device *dev)
-{
- device_lock(dev);
- debug_nvdimm_lock(dev);
-}
-
-static inline void nd_device_unlock(struct device *dev)
-{
- debug_nvdimm_unlock(dev);
- device_unlock(dev);
-}
-#else
-static inline void nd_device_lock(struct device *dev)
-{
- device_lock(dev);
-}
-
-static inline void nd_device_unlock(struct device *dev)
-{
- device_unlock(dev);
-}
-
-static inline void debug_nvdimm_lock(struct device *dev)
-{
-}
-
-static inline void debug_nvdimm_unlock(struct device *dev)
-{
-}
#endif
#endif /* __ND_CORE_H__ */
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index c31e184bfa45..1672d139f708 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -55,7 +55,7 @@ static ssize_t mode_store(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc = 0;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
if (dev->driver)
rc = -EBUSY;
@@ -77,7 +77,7 @@ static ssize_t mode_store(struct device *dev,
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc ? rc : len;
}
@@ -123,14 +123,14 @@ static ssize_t align_store(struct device *dev,
unsigned long aligns[MAX_NVDIMM_ALIGN] = { [0] = 0, };
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_size_select_store(dev, buf, &nd_pfn->align,
nd_pfn_supported_alignments(aligns));
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc ? rc : len;
}
@@ -152,11 +152,11 @@ static ssize_t uuid_store(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc ? rc : len;
}
@@ -181,13 +181,13 @@ static ssize_t namespace_store(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
@@ -199,7 +199,7 @@ static ssize_t resource_show(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
if (dev->driver) {
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
u64 offset = __le64_to_cpu(pfn_sb->dataoff);
@@ -213,7 +213,7 @@ static ssize_t resource_show(struct device *dev,
/* no address to convey if the pfn instance is disabled */
rc = -ENXIO;
}
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
@@ -225,7 +225,7 @@ static ssize_t size_show(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
if (dev->driver) {
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
u64 offset = __le64_to_cpu(pfn_sb->dataoff);
@@ -241,7 +241,7 @@ static ssize_t size_show(struct device *dev,
/* no size to convey if the pfn instance is disabled */
rc = -ENXIO;
}
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 58d95242a836..3992521c151f 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -573,7 +573,7 @@ static void nd_pmem_remove(struct device *dev)
nvdimm_namespace_detach_btt(to_nd_btt(dev));
else {
/*
- * Note, this assumes nd_device_lock() context to not
+ * Note, this assumes device_lock() context to not
* race nd_pmem_notify()
*/
sysfs_put(pmem->bb_state);
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
index 188560b1c110..390123d293ea 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -95,7 +95,7 @@ static void nd_region_remove(struct device *dev)
nvdimm_bus_unlock(dev);
/*
- * Note, this assumes nd_device_lock() context to not race
+ * Note, this assumes device_lock() context to not race
* nd_region_notify()
*/
sysfs_put(nd_region->bb_state);
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 0cb274c2b508..83c1ce7f26a6 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -279,7 +279,7 @@ static ssize_t set_cookie_show(struct device *dev,
* the v1.1 namespace label cookie definition. To read all this
* data we need to wait for probing to settle.
*/
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
if (nd_region->ndr_mappings) {
@@ -296,7 +296,7 @@ static ssize_t set_cookie_show(struct device *dev,
}
}
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
if (rc)
return rc;
@@ -353,12 +353,12 @@ static ssize_t available_size_show(struct device *dev,
* memory nvdimm_bus_lock() is dropped, but that's userspace's
* problem to not race itself.
*/
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
available = nd_region_available_dpa(nd_region);
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return sprintf(buf, "%llu\n", available);
}
@@ -370,12 +370,12 @@ static ssize_t max_available_extent_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev);
unsigned long long available = 0;
- nd_device_lock(dev);
+ device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
available = nd_region_allocatable_dpa(nd_region);
nvdimm_bus_unlock(dev);
- nd_device_unlock(dev);
+ device_unlock(dev);
return sprintf(buf, "%llu\n", available);
}
@@ -549,12 +549,12 @@ static ssize_t region_badblocks_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev);
ssize_t rc;
- nd_device_lock(dev);
+ device_lock(dev);
if (dev->driver)
rc = badblocks_show(&nd_region->bb, buf, 0);
else
rc = -ENXIO;
- nd_device_unlock(dev);
+ device_unlock(dev);
return rc;
}
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 333d41da7621..1f8db59bdddd 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1557,7 +1557,8 @@ config PROVE_NVDIMM_LOCKING
bool "NVDIMM"
depends on LIBNVDIMM
help
- Enable lockdep to validate nd_device_lock() usage.
+ Enable lockdep to validate libnvdimm subsystem usage of the
+ device lock.
config PROVE_CXL_LOCKING
bool "CXL"