linux-kernel - Re: linux-next: build failure after merge of the vfs tree

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Date:   Thu, 20 Sep 2018 20:48:55 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        David Howells <dhowells@...hat.com>
Cc:     Al Viro <viro@...IV.linux.org.uk>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the vfs tree

Stephen Rothwell <sfr@...b.auug.org.au> writes:
> Hi David,
>
> On Wed, 19 Sep 2018 07:01:00 +0100 David Howells <dhowells@...hat.com> wrote:
>>
>> Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>> 
>> > > I think the problem is that I haven't allocated system call numbers for
>> > > any arches other than x86 - even the x86 syscall numbers are provisional
>> > > until the patchset is taken upstream.  I'm not sure of the best way to
>> > > deal with this - make the samples dependent on the X86 arch?  
>> > 
>> > But the sample programs are built with HOSTCC, so you can't depend on
>> > ARCH (since I, for one, am cross compiling).  Maybe SUBARCH.  Better
>> > would be to use either Kconfig's shell primitive or some make magic to
>> > figure out if the syscall number define's are defined.  
>> 
>> I meant put the dependency in the Kconfig.
>
> Yeah, sure.  Kconfig now has the ability for that dependency to be the
> result of an external program "$(shell ....)", so you could have a
> script or program that checked to see if the syscall numbers are
> defined and then have the Kconfig symbol(s) for the tests depend on that.

I realise these are in samples rather than selftests, but what most of
the selftests do is just #define the syscall number if it's not defined,
so that you're not dependent on getting the headers.

cheers