linux-kernel - [PATCH 1/3] lockdep: Fix wait-type for empty stack

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Message-ID: <20210617190313.256987481@infradead.org>
Date:   Thu, 17 Jun 2021 20:57:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...hat.com, will@...nel.org, longman@...hat.com,
        boqun.feng@...il.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        joro@...tes.org, bp@...en8.de, tglx@...utronix.de,
        bigeasy@...utronix.de
Subject: [PATCH 1/3] lockdep: Fix wait-type for empty stack

Even the very first lock can violate the wait-context check, consider
the various IRQ contexts.

Fixes: de8f5e4f2dc1 ("lockdep: Introduce wait-type checks")
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/locking/lockdep.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4577,7 +4577,7 @@ static int check_wait_context(struct tas
 	u8 curr_inner;
 	int depth;
 
-	if (!curr->lockdep_depth || !next_inner || next->trylock)
+	if (!next_inner || next->trylock)
 		return 0;
 
 	if (!next_outer)