powernv build issue

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Hi,

the patch "drm/drm_panel: fix EXPORT of drm_panel_of_backlight" in
linux-next breaks the powernv build:

desktop: ~/git/linux-ppc memtrace $ ./compile.sh
  CALL    scripts/atomic/check-atomics.sh
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  GEN     .version
  CHK     include/generated/compile.h
  UPD     include/generated/compile.h
  CC      init/version.o
  AR      init/built-in.a
  LD      vmlinux.o
  MODPOST vmlinux.o
WARNING: vmlinux.o(.text+0x2fc8): Section mismatch in reference from the
variable start_here_common to the function .init.text:start_kernel()
The function start_here_common() references
the function __init start_kernel().
This is often because start_here_common lacks a __init
annotation or the annotation of start_kernel is wrong.

  MODINFO modules.builtin.modinfo
  LD      .tmp_vmlinux1
ppc64-linux-gnu-ld: drivers/gpu/drm/drm_panel.o: in function
`drm_panel_of_backlight':
(.text+0x434): undefined reference to `devm_of_find_backlight'
make: *** [Makefile:1079: vmlinux] Fehler 1

Reverting it makes it compile again. (not exploring the root issue, I
just need a powernv built and reverting that commit did the trick )

-- 
Thanks,

David / dhildenb

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