linux-kernel - Re: [PATCH] x86/boot: fix kaslr-enabled build

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Date:   Thu, 30 Jan 2020 12:00:08 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, Peter Anvin <hpa@...or.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/boot: fix kaslr-enabled build

On Thu, Jan 30, 2020 at 01:29:26AM +0900, Sergey Senozhatsky wrote:
> Both pgtable_64 and kaslr_64 define `__force_order', which breaks
> the build:
> 
> 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 KASLR use extern pgtable_64's definition.
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> ---
>  arch/x86/boot/compressed/kaslr_64.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/boot/compressed/kaslr_64.c b/arch/x86/boot/compressed/kaslr_64.c
> index 748456c365f4..274df8f9e659 100644
> --- a/arch/x86/boot/compressed/kaslr_64.c
> +++ b/arch/x86/boot/compressed/kaslr_64.c
> @@ -30,7 +30,7 @@
>  #include "../../mm/ident_map.c"
>  
>  /* Used by pgtable.h asm code to force instruction serialization. */
> -unsigned long __force_order;
> +extern unsigned long __force_order;
>  
>  /* Used to track our page table allocation area. */
>  struct alloc_pgt_data {
> -- 

Hmm, I can't trigger that. gcc version and .config pls.

-- 
Regards/Gruss,
    Boris.

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