linux-kernel - [GIT PULL] locking fixes

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Date:   Sat, 20 Apr 2019 09:30:18 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will.deacon@....com>
Subject: [GIT PULL] locking fixes

Linus,

Please pull the latest locking-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-urgent-for-linus

   # HEAD: b50776ae011cfd26df3cc2b4af8b2dc3b683e553 locking/atomics: Don't assume that scripts are executable

A lockdep warning fix and a script execution fix when atomics are 
generated.

 Thanks,

	Ingo

------------------>
Andrew Morton (1):
      locking/atomics: Don't assume that scripts are executable

Bart Van Assche (1):
      locking/lockdep: Make lockdep_unregister_key() honor 'debug_locks' again


 kernel/locking/lockdep.c      | 9 +++++----
 scripts/atomic/gen-atomics.sh | 2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index e16766ff184b..e221be724fe8 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4907,8 +4907,9 @@ void lockdep_unregister_key(struct lock_class_key *key)
 		return;
 
 	raw_local_irq_save(flags);
-	arch_spin_lock(&lockdep_lock);
-	current->lockdep_recursion = 1;
+	if (!graph_lock())
+		goto out_irq;
+
 	pf = get_pending_free();
 	hlist_for_each_entry_rcu(k, hash_head, hash_entry) {
 		if (k == key) {
@@ -4920,8 +4921,8 @@ void lockdep_unregister_key(struct lock_class_key *key)
 	WARN_ON_ONCE(!found);
 	__lockdep_free_key_range(pf, key, 1);
 	call_rcu_zapped(pf);
-	current->lockdep_recursion = 0;
-	arch_spin_unlock(&lockdep_lock);
+	graph_unlock();
+out_irq:
 	raw_local_irq_restore(flags);
 
 	/* Wait until is_dynamic_key() has finished accessing k->hash_entry. */
diff --git a/scripts/atomic/gen-atomics.sh b/scripts/atomic/gen-atomics.sh
index 27400b0cd732..000dc6437893 100644
--- a/scripts/atomic/gen-atomics.sh
+++ b/scripts/atomic/gen-atomics.sh
@@ -13,7 +13,7 @@ gen-atomic-long.sh              asm-generic/atomic-long.h
 gen-atomic-fallback.sh          linux/atomic-fallback.h
 EOF
 while read script header; do
-	${ATOMICDIR}/${script} ${ATOMICTBL} > ${LINUXDIR}/include/${header}
+	/bin/sh ${ATOMICDIR}/${script} ${ATOMICTBL} > ${LINUXDIR}/include/${header}
 	HASH="$(sha1sum ${LINUXDIR}/include/${header})"
 	HASH="${HASH%% *}"
 	printf "// %s\n" "${HASH}" >> ${LINUXDIR}/include/${header}