[PATCH 3/3] driver/core: Fix build error when SRCU and lockdep disabled

[Joel Fernandes (Google)]

Properly check if lockdep lock checking is disabled at config time. If
so, then lock_is_held() is undefined so don't do any checking.

This fix is similar to the pattern used in srcu_read_lock_held().

Link: https://lore.kernel.org/lkml/201908080026.WSAFx14k%25lkp@xxxxxxxxx/
Fixes: c9e4d3a2fee8 ("acpi: Use built-in RCU list checking for acpi_ioremaps list")
Reported-by: kbuild test robot <lkp@xxxxxxxxx>
Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
---
This patch is based on the -rcu dev branch.

 drivers/base/core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 32cf83d1c744..fe25cf690562 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -99,7 +99,11 @@ void device_links_read_unlock(int not_used)
 
 int device_links_read_lock_held(void)
 {
-	return lock_is_held(&device_links_lock);
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	return lock_is_held(&(device_links_lock.dep_map));
+#else
+	return 1;
+#endif
 }
 #endif /* !CONFIG_SRCU */
 
-- 
2.23.0.rc1.153.gdeed80330f-goog