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Donenfeld" Date: Fri, 25 Feb 2022 19:39:30 +0100 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs To: Ard Biesheuvel , Alexander Graf Cc: ACPI Devel Maling List , Linux Kernel Mailing List , Len Brown , "Rafael J. Wysocki" , Greg KH , "Woodhouse, David" Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Okay, the final piece, userspace: /sys/bus/acpi/devices/QEMUVGID:00/modalias gives: acpi:QEMUVGID:VM_GEN_COUNTER: modinfo -F alias vmgenid.ko gives: acpi*:VM_GEN_COUNTER:* udev src uses fnmatch. Bash confirms a match: $ [[ "acpi:QEMUVGID:VM_GEN_COUNTER:" == acpi*:VM_GEN_COUNTER:* ]] && echo matches matches So I think with ACPI_ID_LEN --> 16 we are good to go. Jason