netdev - Re: [PATCH iproute2] iproute2: Fix undeclared __kernel_long

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Date:   Fri, 1 Dec 2017 20:56:24 +0100
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Leon Romanovsky <leon@...nel.org>, netdev@...r.kernel.org,
        Leon Romanovsky <leonro@...lanox.com>,
        Riad Abo Raed <riada@...lanox.com>,
        Guy Ergas <guye@...lanox.com>
Subject: Re: [PATCH iproute2] iproute2: Fix undeclared __kernel_long_t type
 build error in RHEL 6.8

On Fri, Dec 01, 2017 at 08:48:07AM -0800, Stephen Hemminger wrote:
> On Fri,  1 Dec 2017 13:04:51 +0200
> Leon Romanovsky <leon@...nel.org> wrote:
> 
> > From: Leon Romanovsky <leonro@...lanox.com>
> > 
> > Add asm/posix_types.h header file to the list of needed includes,
> > because the headers files in RHEL 6.8 are too old and doesn't
> > have declaration of __kernel_long_t.
> > 
> > In file included from ../include/uapi/linux/kernel.h:5,
> >                  from ../include/uapi/linux/netfilter/x_tables.h:4,
> >                  from ../include/xtables.h:20,
> >                  from em_ipset.c:26:
> > ../include/uapi/linux/sysinfo.h:9: error: expected specifier-qualifier-list before ‘__kernel_long_t’
> > 
> > Cc: Riad Abo Raed <riada@...lanox.com>
> > Cc: Guy Ergas <guye@...lanox.com>
> > Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
> 
> I see the problem, but the solution of dragging in posix_types.h
> would be too much of a long term maintenance issue.
> All the headers in uapi are regularly generated from upstream
> kernel headers; I don't want to start making exceptions.
> 
> Is it just the xtables stuff (which has always been problematic)?

Actually, the only place where __kernel_long_t and __kernel_ulong_t
appear is struct sysinfo in include/uapi/linux/sysinfo.h and this
structure isn't even used anywhere in iproute2 source (not even in the
include/uapi/linux/kernel.h file which includes <linux/sysinfo.h>).

So one could work around the problem by defining _LINUX_SYSINFO_H but
that seems a bit dirty hack.

Michal Kubecek