linux-kernel - [PATCH 1/2] pci: Convert to use built-in RCU list checking

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Date:   Fri, 30 Aug 2019 19:18:16 -0400
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Jonathan Derrick <jonathan.derrick@...el.com>,
        Keith Busch <keith.busch@...el.com>, linux-pci@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: [PATCH 1/2] pci: Convert to use built-in RCU list checking

CONFIG_PROVE_RCU_LIST requires list_for_each_entry_rcu() to pass a
lockdep expression if using srcu or locking for protection. It can only
check regular RCU protection, all other protection needs to be passed as
lockdep expression.

Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 drivers/pci/controller/vmd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index 4575e0c6dc4b..127631d0c6da 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -718,7 +718,8 @@ static irqreturn_t vmd_irq(int irq, void *data)
 	int idx;
 
 	idx = srcu_read_lock(&irqs->srcu);
-	list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
+	list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node,
+				srcu_read_lock_held(&irqs->srcu))
 		generic_handle_irq(vmdirq->virq);
 	srcu_read_unlock(&irqs->srcu, idx);
 
-- 
2.23.0.187.g17f5b7556c-goog