linux-kernel - Re: [PATCH] arm64: export tishift functions to modules

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Message-ID: <20180424154055.GC25964@arm.com>
Date:   Tue, 24 Apr 2018 16:40:56 +0100
From:   Will Deacon <will.deacon@....com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        PaX Team <pageexec@...email.hu>, stable@...r.kernel.org
Subject: Re: [PATCH] arm64: export tishift functions to modules

On Tue, Apr 24, 2018 at 03:43:04PM +0200, Jason A. Donenfeld wrote:
> On Tue, Apr 24, 2018 at 3:34 PM, Will Deacon <will.deacon@....com> wrote:
> > I've not run into any build issues here -- is this specifically with some
> > out-of-tree module?
> 
> I received a bug report email about this. I'm not sure which specific
> module, and I assumed from the email that it was actually a result of
> in-tree configuration options rather than an out-of-tree module, but
> I'm not sure exactly. Either way, I was able to reproduce the problem
> by coding up a little PoC out-of-tree module, so it is certainly a
> real problem.

Any chance you could share the module, please? I tried to write one but
the compiler just inlines the __in128 arithmetic.

Will