linux-kernel - Re: [PATCH] arm/arm64: smccc: Use xN for arm64 register constraints with clang

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Message-ID: <CAKwvOdk4Tos1Q8dyQvic4PUX3cjy3q1hn3FkK=xiVSChht+gEg@mail.gmail.com>
Date:   Thu, 22 Mar 2018 22:26:18 +0000
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     marc.zyngier@....com, Catalin Marinas <catalin.marinas@....com>,
        Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Dave.Martin@....com, Andrey Konovalov <andreyknvl@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Greg Hackmann <ghackmann@...gle.com>
Subject: Re: [PATCH] arm/arm64: smccc: Use xN for arm64 register constraints
 with clang

Note that a patch in this form has previously been implemented by:

Andrey Konovalov <andreyknvl@...gle.com>:
https://gist.github.com/xairy/ee11682ea86044a45c0291c528cd936f

and another by:

Greg Hackmann <ghackmann@...gle.com>:
https://android-review.googlesource.com/c/kernel/common/+/645181

If you used either as a reference, you may want to credit them with a
`Suggested-by:` in the commit message.

On Thu, Mar 22, 2018 at 2:28 PM Matthias Kaehlcke <mka@...omium.org> wrote:
> +#ifndef __clang__
> +#define __reg__ "r"
> +#else
> +#define __reg__ "x"
> +#endif

Can this be flipped to #ifdef __clang__ ?  having an if...else where the
conditional negated is kind of funny.

--
Thanks,
~Nick Desaulniers