bpf: Introduce jit_required flag and remove bpf_prog_has_kfunc_call()

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Introduce a 'jit_required' bitfield flag in struct bpf_prog to track
whether a BPF program strictly requires the JIT compiler to run. This
prevents a dangerous runtime fallback to the interpreter for features
that are only implemented in the JIT compiler.

Currently, bpf_prog_has_kfunc_call() is used only for kernel function
calls, replace the kfunc-specific helper with the new 'jit_required'
flag. This makes it easy to support other JIT-only BPF features, such
as inlined helpers.

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Suggested-by: KaFai Wan <kafai.wan@linux.dev>
Suggested-by: Leon Hwang <leon.hwang@linux.dev>
Acked-by: Leon Hwang <leon.hwang@linux.dev>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

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Tiezhu Yang 2026-07-08 18:18:05 +08:00 • committed by Eduard Zingerman

parent 47b079e211

commit 9a6df65d5c

4 changed files with 8 additions and 20 deletions

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9

include/linux/bpf.h

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7

kernel/bpf/core.c

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5

kernel/bpf/fixups.c

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7

kernel/bpf/verifier.c

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