bpf: Fix build without BPF_SYSCALL, but with BPF_JIT.
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.
Fixes: 1e6c62a882
("bpf: Introduce sleepable BPF programs")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/bpf/20200831155155.62754-1-alexei.starovoitov@gmail.com
This commit is contained in:
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@ -82,7 +82,14 @@ static inline void rcu_read_unlock_trace(void)
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void call_rcu_tasks_trace(struct rcu_head *rhp, rcu_callback_t func);
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void synchronize_rcu_tasks_trace(void);
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void rcu_barrier_tasks_trace(void);
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#else
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/*
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* The BPF JIT forms these addresses even when it doesn't call these
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* functions, so provide definitions that result in runtime errors.
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*/
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static inline void call_rcu_tasks_trace(struct rcu_head *rhp, rcu_callback_t func) { BUG(); }
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static inline void rcu_read_lock_trace(void) { BUG(); }
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static inline void rcu_read_unlock_trace(void) { BUG(); }
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#endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
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#endif /* __LINUX_RCUPDATE_TRACE_H */
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