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You're right: CONFIG_SLAB_VIRTUAL is not in mainline. This patch is against the public, out-of-tree SLAB_VIRTUAL feature branch: https://github.com/thejh/linux/tree/slub-virtual-v7.2 I tested it on commit 699594e8888d (slub-virtual-v7.2-rc5), and confirmed that the same issue is present in slub-virtual-v7.2. I intended the fix for the feature authors to fold into a future revision of their series. I failed to state that dependency in the subject and body, so the standalone email misleadingly looked like a patch against upstream. That was my mistake, sorry for the confusion. Jann, Matteo, and Tamas, please let me know if you would prefer the fix in a differently labeled or rebased form. Thanks, Felix