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Message-ID: <20180628144302.3vzdco636kksmghj@ast-mbp.dhcp.thefacebook.com>
Date:   Thu, 28 Jun 2018 07:43:03 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matteo Croce <mcroce@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] bpfilter: fix user mode helper cross compilation

On Wed, Jun 27, 2018 at 11:17:09PM -0700, Andrew Morton wrote:
> On Wed, 20 Jun 2018 16:04:34 +0200 Matteo Croce <mcroce@...hat.com> wrote:
> 
> > Use $(OBJDUMP) instead of literal 'objdump' to avoid
> > using host toolchain when cross compiling.
> > 
> 
> I'm still having issues here, with ld.
> 
> x86_64 machine, ARCH=i386:
> 
> y:/usr/src/25> make V=1 M=net/bpfilter
> test -e include/generated/autoconf.h -a -e include/config/auto.conf || (       \
> echo >&2;                                                       \
> echo >&2 "  ERROR: Kernel configuration is invalid.";           \
> echo >&2 "         include/generated/autoconf.h or include/config/auto.conf are missing.";\
> echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
> echo >&2 ;                                                      \
> /bin/false)
> mkdir -p net/bpfilter/.tmp_versions ; rm -f net/bpfilter/.tmp_versions/*
> make -f ./scripts/Makefile.build obj=net/bpfilter
> (cat /dev/null;   echo kernel/net/bpfilter/bpfilter.ko;) > net/bpfilter/modules.order
>   ld -m elf_i386   -r -o net/bpfilter/bpfilter.o net/bpfilter/bpfilter_kern.o net/bpfilter/bpfilter_umh.o ; scripts/mod/modpost net/bpfilter/bpfilter.o
> ld: i386:x86-64 architecture of input file `net/bpfilter/bpfilter_umh.o' is incompatible with i386 output

could you please try with this patch
https://patchwork.ozlabs.org/patch/935246/
that is already in net tree?

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