bpfilter: document build requirements for bpfilter_umh
It's not intuitively obvious that bpfilter_umh is a statically linked binary.
Mention the toolchain requirement in the Kconfig help, so people
have an easier time figuring out what's needed.
Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff --git a/net/bpfilter/Kconfig b/net/bpfilter/Kconfig
index 045144d..84015ef 100644
--- a/net/bpfilter/Kconfig
+++ b/net/bpfilter/Kconfig
@@ -13,4 +13,8 @@
default m
help
This builds bpfilter kernel module with embedded user mode helper
+
+ Note: your toolchain must support building static binaries, since
+ rootfs isn't mounted at the time when __init functions are called
+ and do_execv won't be able to find the elf interpreter.
endif
