Public bug reported:
acpi_root_dir is undefined on architectures which are not built with
ACPI. That means that building acpi-call on those arches will fail
starting with 5.2.
On previous kernels, only a warning would be emitted during modpost,
telling that the symbol was undefined. But it also meant that such a
module would not load, making the build kinda pointless.
Starting with 5.2, external modules will also have to define
KBUILD_MODPOST_WARN, in order to build with undefined symbols. See
upstream commit 83da1bed86cdfe3abb2a33c36a2a5aaf5f390ef6 ("modpost: make
KBUILD_MODPOST_WARN also configurable for external modules").
However, I don't think we should fix the build of the module here, as
it's pointless on those architectures where we don't support ACPI.
** Affects: acpi-call (Ubuntu)
Importance: Undecided
Status: Won't Fix
** Changed in: acpi-call (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1830787
Title:
acpi-call won't build on 5.2 kernel for some architectures
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