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SubjectRe: [PATCH bpf-next 1/2] bpf: Add some description about BPF_JIT_ALWAYS_ON in Kconfig
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On 2/11/22 9:57 AM, Tiezhu Yang wrote:
> When CONFIG_BPF_JIT_ALWAYS_ON is enabled, bpf_jit_enable is permanently
> set to 1 and setting any other value than that will return in failure.
>
> Add the above description in the help text of BPF_JIT_ALWAYS_ON, and then
> we can distinguish between BPF_JIT_ALWAYS_ON and BPF_JIT_DEFAULT_ON.
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
> kernel/bpf/Kconfig | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/kernel/bpf/Kconfig b/kernel/bpf/Kconfig
> index d24d518..88409f8 100644
> --- a/kernel/bpf/Kconfig
> +++ b/kernel/bpf/Kconfig
> @@ -58,6 +58,9 @@ config BPF_JIT_ALWAYS_ON
> Enables BPF JIT and removes BPF interpreter to avoid speculative
> execution of BPF instructions by the interpreter.
>
> + When CONFIG_BPF_JIT_ALWAYS_ON is enabled, bpf_jit_enable is permanently
> + set to 1 and setting any other value than that will return in failure.

Small nit here: lets use the full path (/proc/sys/net/core/bpf_jit_enable) in order
to be consistent with the other descriptions in this Kconfig.

> config BPF_JIT_DEFAULT_ON
> def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON
> depends on HAVE_EBPF_JIT && BPF_JIT
>

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