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iommu/arm-smmu-v3: Use the new rb tree helpers
Since v5.12 the rbtree has gained some simplifying helpers aimed at making rb tree users write less convoluted boiler plate code. Instead the caller provides a single comparison function and the helpers generate the prior open-coded stuff. Update smmu->streams to use rb_find_add() and rb_find(). Tested-by: Nicolin Chen <[email protected]> Reviewed-by: Mostafa Saleh <[email protected]> Signed-off-by: Jason Gunthorpe <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
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