netdev - [PATCH bpf-next 1/2] bpf: Add some description about BPF_JIT_ALWAYS

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Message-Id: <1644569851-20859-2-git-send-email-yangtiezhu@loongson.cn>
Date:   Fri, 11 Feb 2022 16:57:30 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Cc:     Xuefeng Li <lixuefeng@...ngson.cn>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next 1/2] bpf: Add some description about BPF_JIT_ALWAYS_ON in Kconfig

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@...ngson.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.
+
 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