From: Qian Cai <cai@lca.pw>
To: jroedel@suse.de
Cc: baolu.lu@linux.intel.com, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, Qian Cai <cai@lca.pw>
Subject: [PATCH -next] iommu/dmar: silence RCU-list debugging warnings
Date: Thu, 5 Mar 2020 15:15:02 -0500 [thread overview]
Message-ID: <1583439302-11393-1-git-send-email-cai@lca.pw> (raw)
Similar to the commit 02d715b4a818 ("iommu/vt-d: Fix RCU list debugging
warnings"), there are several other places that call
list_for_each_entry_rcu() outside of an RCU read side critical section
but with dmar_global_lock held. Silence those false positives as well.
drivers/iommu/intel-iommu.c:4288 RCU-list traversed in non-reader section!!
1 lock held by swapper/0/1:
#0: ffffffff935892c8 (dmar_global_lock){+.+.}, at: intel_iommu_init+0x1ad/0xb97
drivers/iommu/dmar.c:366 RCU-list traversed in non-reader section!!
1 lock held by swapper/0/1:
#0: ffffffff935892c8 (dmar_global_lock){+.+.}, at: intel_iommu_init+0x125/0xb97
drivers/iommu/intel-iommu.c:5057 RCU-list traversed in non-reader section!!
1 lock held by swapper/0/1:
#0: ffffffffa71892c8 (dmar_global_lock){++++}, at: intel_iommu_init+0x61a/0xb13
Signed-off-by: Qian Cai <cai@lca.pw>
---
drivers/iommu/dmar.c | 3 ++-
include/linux/dmar.h | 6 ++++--
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 071bb42bbbc5..7b16c4db40b4 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -363,7 +363,8 @@ static int dmar_pci_bus_notifier(struct notifier_block *nb,
{
struct dmar_drhd_unit *dmaru;
- list_for_each_entry_rcu(dmaru, &dmar_drhd_units, list)
+ list_for_each_entry_rcu(dmaru, &dmar_drhd_units, list,
+ dmar_rcu_check())
if (dmaru->segment == drhd->segment &&
dmaru->reg_base_addr == drhd->address)
return dmaru;
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 712be8bc6a7c..d7bf029df737 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -74,11 +74,13 @@ struct dmar_pci_notify_info {
dmar_rcu_check())
#define for_each_active_drhd_unit(drhd) \
- list_for_each_entry_rcu(drhd, &dmar_drhd_units, list) \
+ list_for_each_entry_rcu(drhd, &dmar_drhd_units, list, \
+ dmar_rcu_check()) \
if (drhd->ignored) {} else
#define for_each_active_iommu(i, drhd) \
- list_for_each_entry_rcu(drhd, &dmar_drhd_units, list) \
+ list_for_each_entry_rcu(drhd, &dmar_drhd_units, list, \
+ dmar_rcu_check()) \
if (i=drhd->iommu, drhd->ignored) {} else
#define for_each_iommu(i, drhd) \
--
1.8.3.1
next reply other threads:[~2020-03-05 20:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-05 20:15 Qian Cai [this message]
2020-03-07 11:53 ` [PATCH -next] iommu/dmar: silence RCU-list debugging warnings Lu Baolu
2020-03-10 9:31 ` Joerg Roedel
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