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Date:   Sun, 25 Nov 2018 20:11:01 +0100 (CET)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     LKML <linux-kernel@vger.kernel.org>
cc:     x86@kernel.org, Peter Zijlstra <peterz@infradead.org>,
        Andy Lutomirski <luto@kernel.org>,
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Subject: Re: [patch V2 21/28] x86/speculation: Prepare for conditional IBPB
 in switch_mm()
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References: <20181125183328.318175777@linutronix.de> <20181125185005.466447057@linutronix.de>
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On Sun, 25 Nov 2018, Thomas Gleixner wrote:
>  /*
> + * 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.
> + */
> +#define LAST_USER_MM_IBPB	0x1UL
> +
> +/*
> +	unsigned long next_tif = task_thread_info(next)->flags;
> +	unsigned long ibpb = (next_tif >> TIF_SPEC_IB) & LAST_USR_MM_IBPB;

That wants to be LAST_USER_ of course. That's what you get for last minute
changes...