linux-kernel - Re: [PATCH v2] crypto: arm64/sha: Add constant operand modifier to ASM

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Message-ID: <20170424080056.GA20285@gondor.apana.org.au>
Date:   Mon, 24 Apr 2017 16:00:56 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Greg Hackmann <ghackmann@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Robin Murphy <robin.murphy@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Grant Grundler <grundler@...omium.org>,
        Michael Davidson <md@...gle.com>
Subject: Re: [PATCH v2] crypto: arm64/sha: Add constant operand modifier to
 ASM_EXPORT

On Tue, Apr 18, 2017 at 10:34:01AM -0700, Matthias Kaehlcke wrote:
> El Tue, Apr 18, 2017 at 04:35:02PM +0100 Ard Biesheuvel ha dit:
> 
> > On 18 April 2017 at 15:47, Paul Gortmaker <paul.gortmaker@...driver.com> wrote:
> > > On Wed, Apr 5, 2017 at 2:34 PM, Matthias Kaehlcke <mka@...omium.org> wrote:
> > >> The operand is an integer constant, make the constness explicit by
> > >> adding the modifier. This is needed for clang to generate valid code
> > >> and also works with gcc.
> > >
> > > Actually it doesn't work with all gcc.  I've got an older arm64 toolchain that I
> > > only use for syntax checking (and hence I don't care if it is the latest and
> > > greatest) and this commit breaks it:
> > >
> > > arch/arm64/crypto/sha1-ce-glue.c:21:2: error: invalid 'asm': invalid
> > > operand prefix '%c'
> > >   asm(".globl " #sym "; .set " #sym ", %c0" :: "i"(val));
> 
> Sorry about that :(

So what's the consensus? Should I revert this patch?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt