linux-kernel - RE: [PATCH v5 03/29] iommu: Apply the new iommufd_object_alloc

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Message-ID: <BN9PR11MB527605018977CA291C0D8E018C98A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Fri, 23 May 2025 07:49:40 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "jgg@...dia.com" <jgg@...dia.com>,
	"corbet@....net" <corbet@....net>, "will@...nel.org" <will@...nel.org>
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Subject: RE: [PATCH v5 03/29] iommu: Apply the new iommufd_object_alloc_ucmd
 helper

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Sunday, May 18, 2025 11:21 AM
> 
> Now the new ucmd-based object allocator eases the finalize/abort routine,
> apply this to all existing allocators that aren't protected by any lock.
> 
> Upgrade the for-driver vIOMMU alloctor too, and pass down to all existing
> viommu_alloc op accordingly.
> 
> Note that __iommufd_object_alloc_ucmd() builds in some static tests that
> cover both static_asserts in the iommufd_viommu_alloc(). Thus drop them.

I may overlook something, but at a quick glance the following check
Is not covered?

-		static_assert(__same_type(struct iommufd_viommu,               \
-					  ((drv_struct *)NULL)->member));      \

Btw this patch doesn't convert all object allocations to the new helper,
e.g. ioas. What is the criteria for when to use the old helpers vs. the
new helpers?