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

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Date:   Mon, 24 Apr 2017 09:04:19 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Matthias Kaehlcke <mka@...omium.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 24 April 2017 at 09:00, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> 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?
>

Yes please.