https://bugzilla.kernel.org/show_bug.cgi?id=206553

--- Comment #24 from Jan Engelhardt (ej+...@inai.de) ---
FreeBSD "accidentally" fixed the issue at some point.

commit fccbffe7d83251aeb28395fd853f38f45bf3782d
Author: jkim <j...@freebsd.org>
Date:   Fri Feb 10 23:30:29 2012 +0000

    De-obfuscate acpi_acquire_global_lock().  It seems the function was
directly
    translated from i386 assembly version.

-       return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY);
+       return ((new & GL_BIT_PENDING) == 0);

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