linux-kernel - Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs

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Date:   Fri, 25 Feb 2022 19:39:30 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Ard Biesheuvel <ardb@...nel.org>, Alexander Graf <graf@...zon.com>
Cc:     ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Woodhouse, David" <dwmw@...zon.co.uk>
Subject: Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs

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