Hi all,

After merging the drm-intel tree, today's linux-next build (x86_64
allmodconfig) failed like this:

In file included from include/linux/spinlock_types.h:18,
                 from include/linux/mutex.h:16,
                 from include/linux/kernfs.h:12,
                 from include/linux/sysfs.h:16,
                 from include/linux/kobject.h:20,
                 from include/linux/of.h:17,
                 from include/linux/irqdomain.h:35,
                 from include/linux/acpi.h:13,
                 from drivers/gpu/drm/i915/i915_drv.c:30:
drivers/gpu/drm/i915/gem/i915_gem_object.h: In function 'i915_gem_object_pin_pages':
include/linux/lockdep.h:635:2: error: too many arguments to function 'lock_release'
  635 |  lock_release(&(lock)->dep_map, 0, _THIS_IP_);  \
      |  ^~~~~~~~~~~~
drivers/gpu/drm/i915/gem/i915_gem_object.h:294:2: note: in expansion of macro 'might_lock_nested'
  294 |  might_lock_nested(&obj->mm.lock, I915_MM_GET_PAGES);
      |  ^~~~~~~~~~~~~~~~~
include/linux/lockdep.h:352:13: note: declared here
  352 | extern void lock_release(struct lockdep_map *lock, unsigned long ip);
      |             ^~~~~~~~~~~~
In file included from include/linux/spinlock_types.h:18,
                 from include/linux/spinlock.h:83,
                 from include/linux/mmzone.h:8,
                 from include/linux/gfp.h:6,
                 from include/linux/slab.h:15,
                 from drivers/gpu/drm/i915/i915_irq.c:32:
drivers/gpu/drm/i915/gem/i915_gem_object.h: In function 'i915_gem_object_pin_pages':
include/linux/lockdep.h:635:2: error: too many arguments to function 'lock_release'
  635 |  lock_release(&(lock)->dep_map, 0, _THIS_IP_);  \
      |  ^~~~~~~~~~~~
drivers/gpu/drm/i915/gem/i915_gem_object.h:294:2: note: in expansion of macro 'might_lock_nested'
  294 |  might_lock_nested(&obj->mm.lock, I915_MM_GET_PAGES);
      |  ^~~~~~~~~~~~~~~~~
include/linux/lockdep.h:352:13: note: declared here
  352 | extern void lock_release(struct lockdep_map *lock, unsigned long ip);
      |             ^~~~~~~~~~~~

Caused by commit

  e692b4021a2e ("lockdep: add might_lock_nested()")

interacting with commit

  5facae4f3549 ("locking/lockdep: Remove unused @nested argument from lock_release()")

from Linus' tree.

I have applied the following merge fix patch for today:

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Tue, 10 Dec 2019 09:37:07 +1100
Subject: [PATCH] lockdep: fix up for lock_release API change

---
 include/linux/lockdep.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 5bbfd5866081..664f52c6dd4c 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -632,7 +632,7 @@ 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_);		\
+	lock_release(&(lock)->dep_map, _THIS_IP_);			\
 } while (0)
 
 #define lockdep_assert_irqs_enabled()	do {				\
-- 
2.24.0

-- 
Cheers,
Stephen Rothwell