linux-kernel - Re: [PATCH] vfio_pci: set TRACE_INCLUDE

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Date:   Tue, 8 Jan 2019 10:47:32 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Alex Williamson <alex.williamson@...hat.com>, kvm@...r.kernel.org,
        Laura Abbott <labbott@...hat.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfio_pci: set TRACE_INCLUDE_PATH to fix the build error

On Tue,  8 Jan 2019 12:08:03 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> drivers/vfio/pci/vfio_pci_nvlink2.c cannot be compiled for in-tree
> building.
> 
>     CC      drivers/vfio/pci/vfio_pci_nvlink2.o
>   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)
>                                           ^
>   compilation terminated.
>   make[1]: *** [scripts/Makefile.build;277: drivers/vfio/pci/vfio_pci_nvlink2.o] Error 1
> 
> To fix the build error, let's tell include/trace/define_trace.h the
> location of drivers/vfio/pci/trace.h
> 
> Fixes: 7f92891778df ("vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2] subdriver")
> Reported-by: Laura Abbott <labbott@...hat.com>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
> 
>  drivers/vfio/pci/trace.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> 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
>  

I think both this and the other fix option via the Makefile are fine
(even though I still slightly prefer the latter), so I'll leave the
choice to the maintainer.

Reviewed-by: Cornelia Huck <cohuck@...hat.com>