linux-kernel - Re: [PATCH] vfio_pci: Add local source directory as include

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Date:   Mon, 7 Jan 2019 19:12:10 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Laura Abbott <labbott@...hat.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Alex Williamson <alex.williamson@...hat.com>,
        kvm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vfio_pci: Add local source directory as include

On Mon, Jan 7, 2019 at 6:18 PM Michael Ellerman <mpe@...erman.id.au> wrote:
>
> Laura Abbott <labbott@...hat.com> writes:
> > Commit 7f92891778df ("vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2]
> > subdriver") introduced a trace.h file in the local directory but
> > missed adding the local include path, resulting in compilation
> > failures with tracepoints:
> >
> > In file included from drivers/vfio/pci/trace.h:102,
> >                  from drivers/vfio/pci/vfio_pci_nvlink2.c:29:
> > ./include/trace/define_trace.h:89:42: fatal error: ./trace.h: No such file or directory
> >  #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
> >
> > Fix this by adjusting the include path.
> >
> > Fixes: 7f92891778df ("vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2] subdriver")
> > Signed-off-by: Laura Abbott <labbott@...hat.com>
> > ---
> > I'd still like to echo my sentiment that this should not be a def_bool.
> > We hit this error on our internal testing and we couldn't even turn
> > off the driver until we fixed this.
>
> I assume there's some reason you can't commit a patch to your tree to
> change it to bool, or turn it off entirely? That would change the SHA
> which is perhaps reason enough.
>
> In general we have far too many options and most of them never get
> turned off (or on), so it just creates testing/bug surface for not much
> benefit. This is one that will probably be turned on in all distro
> kernels for example.
>
> But I have no real objection to making it user configurable.
>
>
> Alex I assume you'll merge this fix via the vfio tree?
>
> cheers
>
> > diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
> > index 9662c063a6b1..08d4676a8495 100644
> > --- a/drivers/vfio/pci/Makefile
> > +++ b/drivers/vfio/pci/Makefile
> > @@ -1,3 +1,4 @@
> > +ccflags-y                               += -I$(src)
> >
> >  vfio-pci-y := vfio_pci.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
> >  vfio-pci-$(CONFIG_VFIO_PCI_IGD) += vfio_pci_igd.o
> > --
> > 2.20.1


Hi.

If I correctly understand the usage of TRACE_INCLUDE_PATH,
the correct fix should be like follows:


diff --git a/drivers/vfio/pci/trace.h b/drivers/vfio/pci/trace.h
index 228ccdb..4d13e51 100644
--- a/drivers/vfio/pci/trace.h
+++ b/drivers/vfio/pci/trace.h
@@ -94,7 +94,7 @@ TRACE_EVENT(vfio_pci_npu2_mmap,
 #endif /* _TRACE_VFIO_PCI_H */

 #undef TRACE_INCLUDE_PATH
-#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_PATH ../../drivers/vfio/pci
 #undef TRACE_INCLUDE_FILE
 #define TRACE_INCLUDE_FILE trace









-- 
Best Regards
Masahiro Yamada