On Wed, Jan 21, 2026 at 05:24:21PM -0800, Nicolin Chen wrote:

Once arm_smmu_attach_prepare() installs an iotlb tag to smmu_domain->invs,
arm_smmu_domain_get_iotlb_tag() callers should get the tag from the array.

Only the arm_smmu_domain_get_iotlb_tag() caller for new_smmu_domain in the
arm_smmu_attach_prepare_invs() will be allowed to allocate a new tag.

It would be nicer to have two functions 'alloc' and 'find' instead of
the bool. Alloc would call find.

The logic looks sound otherwise

Jason