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From: Daniel Borkmann <>
To: Alexei Starovoitov <>,
Subject: Re: [PATCH v2 bpf-next] bpf: Fix build without BPF_SYSCALL, but with BPF_JIT.
Date: Mon, 31 Aug 2020 22:07:28 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 8/31/20 5:51 PM, Alexei Starovoitov wrote:
> From: Alexei Starovoitov <>
> When CONFIG_BPF_SYSCALL is not set, but CONFIG_BPF_JIT=y
> the kernel build fails:
> In file included from ../kernel/bpf/trampoline.c:11:
> ../kernel/bpf/trampoline.c: In function ‘bpf_trampoline_update’:
> ../kernel/bpf/trampoline.c:220:39: error: ‘call_rcu_tasks_trace’ undeclared
> ../kernel/bpf/trampoline.c: In function ‘__bpf_prog_enter_sleepable’:
> ../kernel/bpf/trampoline.c:411:2: error: implicit declaration of function ‘rcu_read_lock_trace’
> ../kernel/bpf/trampoline.c: In function ‘__bpf_prog_exit_sleepable’:
> ../kernel/bpf/trampoline.c:416:2: error: implicit declaration of function ‘rcu_read_unlock_trace’
> This is due to:
> obj-$(CONFIG_BPF_JIT) += trampoline.o
> obj-$(CONFIG_BPF_JIT) += dispatcher.o
> There is a number of functions that arch/x86/net/bpf_jit_comp.c is
> using from these two files, but none of them will be used when
> only cBPF is on (which is the case for BPF_SYSCALL=n BPF_JIT=y).
> Add rcu_trace functions to rcupdate_trace.h. The JITed code won't execute them
> and BPF trampoline logic won't be used without BPF_SYSCALL.
> Reported-by: kernel test robot <>
> Fixes: 1e6c62a88215 ("bpf: Introduce sleepable BPF programs")
> Acked-by: Paul E. McKenney <>
> Signed-off-by: Alexei Starovoitov <>

Applied, thanks!

      parent reply	other threads:[~2020-08-31 20:07 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-31 15:51 Alexei Starovoitov
2020-08-31 16:15 ` Paul E. McKenney
2020-08-31 16:19   ` Alexei Starovoitov
2020-08-31 20:07 ` Daniel Borkmann [this message]

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