netdev - Re: linux-next: Tree for May 12 (arch/x86/net/bpf_jit

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Message-ID: <daf46ee7-1a18-9d5a-c3b3-7fc55ec23b30@iogearbox.net>
Date:   Wed, 12 May 2021 20:53:36 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: linux-next: Tree for May 12 (arch/x86/net/bpf_jit_comp32.o)

Hi Randy,

On 5/12/21 8:01 PM, Randy Dunlap wrote:
> On 5/12/21 12:56 AM, Stephen Rothwell wrote:
>> Hi all,
>>
>> Changes since 20210511:
>>
> 
> on i386:
> 
> ld: arch/x86/net/bpf_jit_comp32.o: in function `do_jit':
> bpf_jit_comp32.c:(.text+0x28c9): undefined reference to `__bpf_call_base'
> ld: arch/x86/net/bpf_jit_comp32.o: in function `bpf_int_jit_compile':
> bpf_jit_comp32.c:(.text+0x3694): undefined reference to `bpf_jit_blind_constants'
> ld: bpf_jit_comp32.c:(.text+0x3719): undefined reference to `bpf_jit_binary_free'
> ld: bpf_jit_comp32.c:(.text+0x3745): undefined reference to `bpf_jit_binary_alloc'
> ld: bpf_jit_comp32.c:(.text+0x37d3): undefined reference to `bpf_jit_prog_release_other'
> ld: kernel/extable.o: in function `search_exception_tables':
> extable.c:(.text+0x42): undefined reference to `search_bpf_extables'
> ld: kernel/extable.o: in function `kernel_text_address':
> extable.c:(.text+0xee): undefined reference to `is_bpf_text_address'
> ld: kernel/kallsyms.o: in function `kallsyms_lookup_size_offset':
> kallsyms.c:(.text+0x254): undefined reference to `__bpf_address_lookup'
> ld: kernel/kallsyms.o: in function `kallsyms_lookup_buildid':
> kallsyms.c:(.text+0x2ee): undefined reference to `__bpf_address_lookup'

Thanks for reporting, could you double check the following diff:

diff --git a/kernel/bpf/Kconfig b/kernel/bpf/Kconfig
index 26b591e23f16..bd04f4a44c01 100644
--- a/kernel/bpf/Kconfig
+++ b/kernel/bpf/Kconfig
@@ -37,6 +37,7 @@ config BPF_SYSCALL

  config BPF_JIT
  	bool "Enable BPF Just In Time compiler"
+	depends on BPF
  	depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
  	depends on MODULES
  	help