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UPSTREAM: bpf: Disallow BPF_PRELOAD in allmodconfig builds

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The CC_CAN_LINK checks that the host compiler can link, but bpf_preload
relies on libbpf which in turn needs libelf to be present during linking.
allmodconfig runs in odd setups with cross compilers and missing host
libraries like libelf. Instead of extending kconfig with every possible
library that bpf_preload might need disallow building BPF_PRELOAD in
such build-only configurations.

Change-Id: I445e63f1a02c73367f52a19e7412ba4401092dea
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov 2020-08-25 15:23:46 -07:00 • committed by basamaryan
commit c4f8c9036c
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3
kernel/bpf/preload/Kconfig
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@ -6,6 +6,9 @@ config USERMODE_DRIVER
menuconfig BPF_PRELOAD
bool "Preload BPF file system with kernel specific program and map iterators"
depends on BPF
# The dependency on !COMPILE_TEST prevents it from being enabled
# in allmodconfig or allyesconfig configurations
depends on !COMPILE_TEST
select USERMODE_DRIVER
help
This builds kernel module with several embedded BPF programs that are