linux-kernel - Re: [PATCH 2/2] x86/speculation: Simplify indirect_branch_prediction

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Date:   Sat, 27 Jan 2018 12:32:41 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        tim.c.chen@...ux.intel.com, pjt@...gle.com, jikos@...nel.org,
        gregkh@...ux-foundation.org, dave.hansen@...el.com,
        riel@...hat.com, luto@...capital.net,
        torvalds@...ux-foundation.org, ak@...ux.intel.com,
        keescook@...gle.com, peterz@...radead.org
Subject: Re: [PATCH 2/2] x86/speculation: Simplify
 indirect_branch_prediction_barrier()

On Fri, 2018-01-26 at 21:08 +0100, Borislav Petkov wrote:
> 
> --- a/arch/x86/include/asm/processor.h
> +++ b/arch/x86/include/asm/processor.h
> @@ -971,4 +971,8 @@ bool xen_set_default_idle(void);
>  
>  void stop_this_cpu(void *dummy);
>  void df_debug(struct pt_regs *regs, long error_code);
> +
> +#ifdef CONFIG_RETPOLINE
> +void __ibp_barrier(void);
> +#endif
>  #endif /* _ASM_X86_PROCESSOR_H */

Did I already say that needs to live in asm-prototypes.h? And it needs
to be exported to modules, I think.
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