Re: [PATCH] x86/retpoline: Avoid return buffer underflows on context switch

[Woodhouse, David]

On Mon, 2018-01-08 at 23:26 +0100, Peter Zijlstra wrote:
> 
> > is because that might get interpreted as a "push %rip" and not go on
> > the RSB at all. Hence the 'pause' between each one.
> 
> OK, then make the comment say that.

Fixed. I've also shifted the #ifdef CONFIG_RETPOLINE to the call sites
instead of inside the FILL_RETURN_BUFFER macro itself. This is going to
get used with IBRS code too, Real Soon Nowâ.

http://git.infradead.org/users/dwmw2/linux-retpoline.git/commitdiff/6e961b86558

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