linux-kernel - Re: [PATCH v3 3/5] arch/x86/mm: Refactor cond

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Date:   Fri, 17 Apr 2020 15:07:31 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Balbir Singh <sblbir@...zon.com>, linux-kernel@...r.kernel.org
Cc:     jpoimboe@...hat.com, tony.luck@...el.com, keescook@...omium.org,
        benh@...nel.crashing.org, x86@...nel.org, dave.hansen@...el.com,
        Balbir Singh <sblbir@...zon.com>
Subject: Re: [PATCH v3 3/5] arch/x86/mm: Refactor cond_ibpb() to support other use cases

Balbir Singh <sblbir@...zon.com> writes:
>  
>  /*
> - * Use bit 0 to mangle the TIF_SPEC_IB state into the mm pointer which is
> - * stored in cpu_tlb_state.last_user_mm_ibpb.
> + * Bits to mangle the TIF_SPEC_IB state into the mm pointer which is
> + * stored in cpu_tlb_state.last_user_mm_spec.
>   */
>  #define LAST_USER_MM_IBPB	0x1UL
> +#define LAST_USER_MM_SPEC_MASK	(LAST_USER_MM_IBPB)
>  
>  	/* Reinitialize tlbstate. */
> -	this_cpu_write(cpu_tlbstate.last_user_mm_ibpb, LAST_USER_MM_IBPB);
> +	this_cpu_write(cpu_tlbstate.last_user_mm_spec, LAST_USER_MM_IBPB);

Shouldn't that be LAST_USER_MM_MASK?

Thanks,

        tglx