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

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Date:   Sun, 11 Aug 2019 18:11:11 -0400
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        kbuild test robot <lkp@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Josh Triplett <josh@...htriplett.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        linux-doc@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>, rcu@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>, Tejun Heo <tj@...nel.org>
Subject: [PATCH 3/3] driver/core: Fix build error when SRCU and lockdep disabled

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@intel.com/
Fixes: c9e4d3a2fee8 ("acpi: Use built-in RCU list checking for acpi_ioremaps list")
Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
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