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The config fragment already sets CONFIG_UDMABUF=y, but kconfig silently drops it. UDMABUF/NET_DEVMEM both depend on DMA_SHARED_BUFFER, which we can't enable directly, so we need to enable a config that selects it. We use SYNC_FILE for that purpose here. Additionally, we flip on CONFIG_NET_DEVMEM as well. Suggested-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com> Reviewed-by: Mina Almasry <almasrymina@google.com> Link: https://patch.msgid.link/20260731-selftests-devmem-config-v1-1-098014348d9d@meta.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>