Re: [PATCH bpf-next v2 1/2] bpf: Add some description about BPF_JIT_ALWAYS_ON in Kconfig
From: Song Liu <song@kernel.org>
Date: 2022-02-22 02:01:26
Also in:
bpf, lkml
On Fri, Feb 18, 2022 at 7:15 PM Tiezhu Yang [off-list ref] wrote:
quoted hunk ↗ jump to hunk
When CONFIG_BPF_JIT_ALWAYS_ON is enabled, /proc/sys/net/core/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 config 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 | 4 ++++ 1 file changed, 4 insertions(+)diff --git a/kernel/bpf/Kconfig b/kernel/bpf/Kconfig index d24d518..cbf3f65 100644 --- a/kernel/bpf/Kconfig +++ b/kernel/bpf/Kconfig@@ -58,6 +58,10 @@ 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, /proc/sys/net/core/bpf_jit_enable + is permanently set to 1 and setting any other value than that will return + in failure.
nit: "return failure" (no "in"). Other than this, Acked-by: Song Liu <redacted>
+
config BPF_JIT_DEFAULT_ON
def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON
depends on HAVE_EBPF_JIT && BPF_JIT
--
2.1.0