From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 13 Dec 2006 08:34:40 +0000 (-0800)
Subject: [PATCH] lockdep: improve lockdep_reset()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=23d95a03d63eff25118b50737006ce6e7c1b8def;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] lockdep: improve lockdep_reset()

Clear all the chains during lockdep_reset().  This fixes some locking-selftest
false positives i saw on -rt.  (never saw those on mainline though, but it
could happen.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 5ba2825bd46a..77fa791f6f31 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2437,6 +2437,7 @@ EXPORT_SYMBOL_GPL(lock_release);
 void lockdep_reset(void)
 {
 	unsigned long flags;
+	int i;
 
 	raw_local_irq_save(flags);
 	current->curr_chain_key = 0;
@@ -2447,6 +2448,8 @@ void lockdep_reset(void)
 	nr_softirq_chains = 0;
 	nr_process_chains = 0;
 	debug_locks = 1;
+	for (i = 0; i < CHAINHASH_SIZE; i++)
+		INIT_LIST_HEAD(chainhash_table + i);
 	raw_local_irq_restore(flags);
 }