Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Jianlin Lv <Jianlin.Lv@arm.com>
To:     bpf@vger.kernel.org
Cc:     davem@davemloft.net, kuba@kernel.org, ast@kernel.org,
        daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com,
        songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com,
        kpsingh@kernel.org, viro@zeniv.linux.org.uk, rdna@fb.com,
        dvyukov@google.com, nicolas.dichtel@6wind.com,
        keescook@chromium.org, masahiroy@kernel.org, maheshb@google.com,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        Jianlin.Lv@arm.com, iecedge@gmail.com, nd@arm.com
Subject: [PATCH bpf-next] bpf: trace jit code when enable BPF_JIT_ALWAYS_ON
Date:   Fri, 26 Mar 2021 20:40:30 +0800
Message-Id: <20210326124030.1138964-1-Jianlin.Lv@arm.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

When CONFIG_BPF_JIT_ALWAYS_ON is enabled, the value of bpf_jit_enable in
/proc/sys is limited to SYSCTL_ONE. This is not convenient for debugging.
This patch modifies the value of extra2 (max) to 2 that support developers
to emit traces on kernel log.

Signed-off-by: Jianlin Lv <Jianlin.Lv@arm.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 d84c8a1b280e..aa16883ac445 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -386,7 +386,7 @@ 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,
-- 
2.25.1