Re: kbuild: fix section mismatch check for vmlinux

[Jan Beulich]

>vmlinux does not contain relocation entries which is
>used by the section mismatch checks.
>Reported by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
>
>Use the individual objects as inputs to overcome
>this limitation.
>In modpost check the .o files and skip non-ELF files.
>
>Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>

This still doesn't appear to catch all cases - since the checking logic works
on a per-module basis, references between the individual .o files aren't
being checked. A current instance where this is visible is x86-64's recently
added alloc_bootmem_high_node (non-__init, in arch/x86_64/mm/built-in.o)
calling __alloc_bootmem_core (__init, in mm/built-in.o). I suppose there's
no way around linking $(KBUILD_VMLINUX_OBJS) into vmlinux.o, and
checking that file instead.

Jan

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