linux-kernel - [PATCH 2/3] lockdep: add might_lock

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Date:   Mon,  4 Nov 2019 18:37:19 +0100
From:   Daniel Vetter <daniel.vetter@...ll.ch>
To:     Intel Graphics Development <intel-gfx@...ts.freedesktop.org>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Peter Zijlstra <peterz@...radead.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] lockdep: add might_lock_nested()

Necessary to annotate functions where we might acquire a
mutex_lock_nested() or similar. Needed by i915.

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Will Deacon <will@...nel.org>
Cc: linux-kernel@...r.kernel.org
---
 include/linux/lockdep.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index e0eca94e58c8..c4155436e6fc 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -628,6 +628,13 @@ do {									\
 	lock_acquire(&(lock)->dep_map, 0, 0, 1, 1, NULL, _THIS_IP_);	\
 	lock_release(&(lock)->dep_map, 0, _THIS_IP_);			\
 } while (0)
+# define might_lock_nested(lock, subclass) 				\
+do {									\
+	typecheck(struct lockdep_map *, &(lock)->dep_map);		\
+	lock_acquire(&(lock)->dep_map, subclass, 0, 1, 1, NULL,		\
+		     _THIS_IP_);					\
+	lock_release(&(lock)->dep_map, 0, _THIS_IP_);		\
+} while (0)
 
 #define lockdep_assert_irqs_enabled()	do {				\
 		WARN_ONCE(debug_locks && !current->lockdep_recursion &&	\
@@ -650,6 +657,7 @@ do {									\
 #else
 # define might_lock(lock) do { } while (0)
 # define might_lock_read(lock) do { } while (0)
+# define might_lock_nested(lock, subclass) do { } while (0)
 # define lockdep_assert_irqs_enabled() do { } while (0)
 # define lockdep_assert_irqs_disabled() do { } while (0)
 # define lockdep_assert_in_irq() do { } while (0)
-- 
2.24.0.rc2