linux-kernel - Re: [PATCH 2/7] arm64: Implement copy_thread

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Message-ID: <20200107193054.t2d4txgz3fnrw3gn@wittgenstein>
Date:   Tue, 7 Jan 2020 20:30:54 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Will Deacon <will@...nel.org>,
        Amanieu d'Antras <amanieu@...il.com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org,
        Christian Brauner <christian@...uner.io>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 2/7] arm64: Implement copy_thread_tls

On Tue, Jan 07, 2020 at 10:12:39AM -0800, Kees Cook wrote:
> On Tue, Jan 07, 2020 at 05:45:09PM +0000, Will Deacon wrote:
> > On Tue, Jan 07, 2020 at 10:02:27AM +0100, Christian Brauner wrote:
> > > [Cc Kees in case he knows something about where arch specific tests live
> > >  or whether we have a framework for this]
> > > [...]
> > > It feels like we must've run into the "this is architecture
> > > specific"-and-we-want-to-test-this issue before... Do we have a place
> > > where architecture specific selftests live?
> > 
> > For arch-specific selftests there are tools/testing/selftests/$ARCH
> > directories, although in this case maybe it's better to have an #ifdef
> > in a header so that architectures with __builtin_thread_pointer can use
> > that.
> 
> Yup, I agree: that's the current best-practice for arch-specific
> selftests.

Thanks! I think using #ifdef in this case with __builtin_thread_pointer
sounds good.
So the tests can be moved into the clone3() test-suite for those
architectures.

Christian