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* [PATCH] [net-next, wrong] make BPFILTER_UMH depend on X86
@ 2018-05-28 15:31 Arnd Bergmann
  2018-05-30 15:17 ` Alexei Starovoitov
  2018-06-08  8:57 ` Geert Uytterhoeven
  0 siblings, 2 replies; 8+ messages in thread
From: Arnd Bergmann @ 2018-05-28 15:31 UTC (permalink / raw)
  To: David S. Miller, Alexei Starovoitov
  Cc: Arnd Bergmann, Masahiro Yamada, linux-kbuild, netdev, linux-kernel

When build testing across architectures, I run into a build error on
all targets other than X86:

gcc-8.1.0-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-objdump: net/bpfilter/bpfilter_umh: File format not recognized
gcc-8.1.0-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-objcopy:net/bpfilter/bpfilter_umh.o: Invalid bfd target

The problem is that 'hostprogs' get built with 'gcc' rather than
'$(CROSS_COMPILE)gcc', and my default gcc (as most people's) targets x86.

To work around it, adding an X86 dependency gets randconfigs building
again on my box.

Clearly, this is not a good solution, since it should actually work fine
when building native kernels on other architectures but that is now
disabled, while cross building an x86 kernel on another host is still
broken after my patch.

What we probably want here is to try out if the compiler is able to build
executables for the target architecture and not build the helper otherwise,
at least when compile-testing. No idea how to do that though.

Cc: Masahiro Yamada <>
Signed-off-by: Arnd Bergmann <>
 net/bpfilter/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/bpfilter/Kconfig b/net/bpfilter/Kconfig
index 60725c5f79db..61cc4fcbb4d0 100644
--- a/net/bpfilter/Kconfig
+++ b/net/bpfilter/Kconfig
@@ -9,6 +9,7 @@ menuconfig BPFILTER
 	tristate "bpfilter kernel module with user mode helper"
+	depends on X86 # actually depends on native builds
 	default m
 	  This builds bpfilter kernel module with embedded user mode helper

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2018-06-08  9:41 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-05-28 15:31 [PATCH] [net-next, wrong] make BPFILTER_UMH depend on X86 Arnd Bergmann
2018-05-30 15:17 ` Alexei Starovoitov
2018-05-31  1:42   ` Masahiro Yamada
2018-06-01 15:20     ` Arnd Bergmann
2018-06-04 23:51       ` Alexei Starovoitov
2018-06-08  8:57 ` Geert Uytterhoeven
2018-06-08  9:33   ` Daniel Borkmann
2018-06-08  9:40     ` Geert Uytterhoeven

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