Re: linux-next: Tree for Mar 31 (build failures and culprits)

[Guenter Roeck]

On 03/31/2015 07:24 PM, Guenter Roeck wrote:
> On 03/31/2015 04:42 PM, Stephen Rothwell wrote:
> > Hi Greg,
> >
> > On Wed, 1 Apr 2015 01:07:49 +0200 Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> > > On Tue, Mar 31, 2015 at 09:16:40AM -0700, Guenter Roeck wrote:
> > > > alpha:allmodconfig
> > > > mips:allmodconfig
> > > >
> > > > samples/kdbus/kdbus-workers.c: In function âprime_newâ:
> > > > samples/kdbus/kdbus-workers.c:930:18: error: â__NR_memfd_createâ undeclared
> > > > (first use in this function)
> > > >    p->fd = syscall(__NR_memfd_create, "prime-area", MFD_CLOEXEC);
> > > >
> > > > Looks like the kdbus example never worked for the affected architectures.
> > > > I don't build allmodconfig for all architectures, so other architectures
> > > > may be affected as well.
> > >
> > > You need 3.17 kernel headers to have memfd_create, not much the kdbus
> > > test code can do about that.  You might want to update the kernel
> > > headers for these build boxes.
> > >
> > > Or have we not hooked up memfd for alpha and mips?
> >
> > alpha has no definition for __NR_memfd_create and doesn't use
> > asm-generic/unistd.h.
> >
> > mips has a definition for __NR_memfd_create if _MIPS_SIM ==
> > _MIPS_SIM_ABI32, _MIPS_SIM_ABI64 or _MIPS_SIM_NABI32 (is there any
> > other alternative?).
>
> Guess you are saying that those examples won't build even with a
> newer toolchain. Good that I already decided not to re-build my
> toolchains ;-).
>
> Now I am left with the question if the samples build should be
> masked for alpha and mips, or if I should drop building samples
> from my 'allmodconfig' builds. I think I'll do the latter;
> there seems to be an expectation that samples are built with
> a recent toolchain, and I can not keep rebuilding toolchains for
> the rest of my life.

Weird - the kdbus sample doesn't have its own configuration option,
unlike other samples. So it's all or nothing for alpha and mips.

Guenter

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