linux-kernel - [PATCH v2 08/14] iommufd/selftest: Drop parent domain from mock_iommu_domain

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Message-ID: <0f155a7cd71034a498448fe4828fb4aaacdabf95.1749882255.git.nicolinc@nvidia.com>
Date: Fri, 13 Jun 2025 23:35:20 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>
CC: <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
	<praan@...gle.com>, <yi.l.liu@...el.com>, <peterz@...radead.org>,
	<jsnitsel@...hat.com>, <linux-arm-kernel@...ts.infradead.org>,
	<iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<patches@...ts.linux.dev>, <baolu.lu@...ux.intel.com>
Subject: [PATCH v2 08/14] iommufd/selftest: Drop parent domain from mock_iommu_domain_nested

There is no use of this parent domain. Delete the dead code.

Note that the s2_parent in struct mock_viommu will be a deadcode too. Yet,
keep it because it will be soon used by HW queue objects, i.e. no point in
adding it back and forth in such a short window. Besides, keeping it could
cover the majority of vIOMMU use cases where a driver-level structure will
be larger in size than the core structure.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/iommufd/selftest.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 4d5dca8027b1..f9cfb3a20860 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -138,7 +138,6 @@ to_mock_domain(struct iommu_domain *domain)
 struct mock_iommu_domain_nested {
 	struct iommu_domain domain;
 	struct mock_viommu *mock_viommu;
-	struct mock_iommu_domain *parent;
 	u32 iotlb[MOCK_NESTED_DOMAIN_IOTLB_NUM];
 };
 
@@ -434,7 +433,6 @@ mock_domain_alloc_nested(struct device *dev, struct iommu_domain *parent,
 	mock_nested = __mock_domain_alloc_nested(user_data);
 	if (IS_ERR(mock_nested))
 		return ERR_CAST(mock_nested);
-	mock_nested->parent = mock_parent;
 	return &mock_nested->domain;
 }
 
@@ -692,7 +690,6 @@ mock_viommu_alloc_domain_nested(struct iommufd_viommu *viommu, u32 flags,
 	if (IS_ERR(mock_nested))
 		return ERR_CAST(mock_nested);
 	mock_nested->mock_viommu = mock_viommu;
-	mock_nested->parent = mock_viommu->s2_parent;
 	return &mock_nested->domain;
 }
 
-- 
2.43.0