netdev - [PATCH bpf-next] bpf: support bpf_jit_enable=2 for CONFIG_BPF_JIT_ALWAYS

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Message-ID: <20211231153550.3807430-1-houtao1@huawei.com>
Date:   Fri, 31 Dec 2021 23:35:50 +0800
From:   Hou Tao <houtao1@...wei.com>
To:     Alexei Starovoitov <ast@...nel.org>
CC:     Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <houtao1@...wei.com>
Subject: [PATCH bpf-next] bpf: support bpf_jit_enable=2 for CONFIG_BPF_JIT_ALWAYS_ON

bpf_jit_enable=2 is used to dump the jited images for debug purpose,
however if CONFIG_BPF_JIT_ALWAYS_ON is enabled, its value is fixed
as one and can not be changed. So make the debug switch work again.

Signed-off-by: Hou Tao <houtao1@...wei.com>
---
 net/core/sysctl_net_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 7b4d485aac7a..20e44427afa8 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -387,7 +387,7 @@ static struct ctl_table net_core_table[] = {
 		.proc_handler	= proc_dointvec_minmax_bpf_enable,
 # ifdef CONFIG_BPF_JIT_ALWAYS_ON
 		.extra1		= SYSCTL_ONE,
-		.extra2		= SYSCTL_ONE,
+		.extra2		= &two,
 # else
 		.extra1		= SYSCTL_ZERO,
 		.extra2		= &two,
-- 
2.27.0