linux-kernel - Re: [PATCH v6 01/10] x86/retpoline: Add initial retpoline support

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Date:   Mon, 08 Jan 2018 10:53:02 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Andi Kleen <ak@...ux.intel.com>, Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>, tglx@...utronix.de,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>, gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH v6 01/10] x86/retpoline: Add initial retpoline support

On Mon, 2018-01-08 at 11:45 +0100, Peter Zijlstra wrote:
> 
> 
> Should this not use local name labels instead?
> 
> .macro RETPOLINE_JMP reg:req
>         call    .Ldo_rop_\@
> .Lspec_trap_\@:
>         pause
>         jmp .Lspec_trap_\@
> .Ldo_rop_\@:
>         mov     \reg, (%_ASM_SP)
>         ret
> .endm

Not if you want to be able to use them twice in the same .S file.
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