Re: [PATCH] x86: Don't clare __force_order in kaslr_64.c

[Andy Lutomirski]

> On Jan 24, 2020, at 10:18 AM, H.J. Lu <hjl.tools@xxxxxxxxx> wrote:
> 
> ïGCC 10 changed the default to -fno-common, which leads to
> 
>  LD      arch/x86/boot/compressed/vmlinux
> ld: arch/x86/boot/compressed/pgtable_64.o:(.bss+0x0): multiple definition of `__force_order'; arch/x86/boot/compressed/kaslr_64.o:(.bss+0x0): first defined here
> make[2]: *** [arch/x86/boot/compressed/Makefile:119: arch/x86/boot/compressed/vmlinux] Error 1
> 
> Since __force_order is already provided in pgtable_64.c, there is no
> need to declare __force_order in kaslr_64.c.

Why does anything actually define that variable?  Surely any actual references are just an outright bug.  Is it needed for LTO?