linux-kernel - [PATCH] bpf: BPF_PRELOAD depends on BPF

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Date:   Thu,  5 Nov 2020 11:51:09 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH] bpf: BPF_PRELOAD depends on BPF_SYSCALL

Fix build error when BPF_SYSCALL is not set/enabled but BPF_PRELOAD is
by making BPF_PRELOAD depend on BPF_SYSCALL.

ERROR: modpost: "bpf_preload_ops" [kernel/bpf/preload/bpf_preload.ko] undefined!

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: netdev@...r.kernel.org
Cc: bpf@...r.kernel.org
---
 kernel/bpf/preload/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20201105.orig/kernel/bpf/preload/Kconfig
+++ linux-next-20201105/kernel/bpf/preload/Kconfig
@@ -6,6 +6,7 @@ config USERMODE_DRIVER
 menuconfig BPF_PRELOAD
 	bool "Preload BPF file system with kernel specific program and map iterators"
 	depends on BPF
+	depends on BPF_SYSCALL
 	# The dependency on !COMPILE_TEST prevents it from being enabled
 	# in allmodconfig or allyesconfig configurations
 	depends on !COMPILE_TEST