netdev - Re: [PATCH iproute2] Fix compilation with kernel headers

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Date:   Mon, 26 Feb 2018 21:27:10 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     Thomas De Schampheleire <thomas.de_schampheleire@...ia.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] Fix compilation with kernel headers < 3.4

Thomas De Schampheleire wrote:
> Since commit 596b1c94aa38e21b7a8c8562e8b61ccb744255d2, iproute2 uses types
> __kernel_long_t and __kernel_ulong_t but does not provide internal
> definitions for it.

I tried one time to build with headers from 3.2 (last supported LTS at
the moment) and found that AF_VSOCK is missing. As result of defining
AF_VSOCK we need to adjust AF_MAX. Not sure this is correct at all but
this helps to build with old headers.

diff --git a/misc/ss.c b/misc/ss.c
index 49f9c49..2849bc6 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -46,6 +46,16 @@
 #include <linux/sctp.h>
 #include <linux/vm_sockets_diag.h>

+#ifndef AF_VSOCK
+#define AF_VSOCK       40
+#if defined(AF_MAX) && AF_MAX < 41
+#undef AF_MAX
+#endif
+#ifndef AF_MAX
+#define AF_MAX         41
+#endif /* AF_MAX */
+#endif /* AF_VSOCK */

> 
> This means that compilation using kernel headers that are older than 3.4
> (where these types were added) will fail. This situation may be uncommon for
> native compilation, but not uncommon for cross compilation where the
> toolchains may be a bit older.
> 
> Provide the necessary types internally if not provided by the kernel
> headers to fix compilation in such cases.
> 
> Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@...ia.com>
> ---
>  include/uapi/linux/posix_types.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/include/uapi/linux/posix_types.h b/include/uapi/linux/posix_types.h
> index 9a7a740b..60f3d378 100644
> --- a/include/uapi/linux/posix_types.h
> +++ b/include/uapi/linux/posix_types.h
> @@ -35,4 +35,13 @@ typedef int __kernel_mqd_t;
>  
>  #include <asm/posix_types.h>
>  
> +/* in case the kernel header asm/posix_types.h is too old (< 3.4) to provide
> + * __kernel_long_t, provide it here */
> +#ifndef __kernel_long_t
> +typedef long		__kernel_long_t;
> +#endif
> +#ifndef __kernel_ulong_t
There is no such define. Only __kernel_long_t.

> +typedef unsigned long	__kernel_ulong_t;
> +#endif
> +
>  #endif /* _LINUX_POSIX_TYPES_H */
> 




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