linux-kernel - [PATCH bpf-next] bpf: trace jit code when enable BPF_JIT_ALWAYS

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Message-Id: <20210326124030.1138964-1-Jianlin.Lv@arm.com>
Date:   Fri, 26 Mar 2021 20:40:30 +0800
From:   Jianlin Lv <Jianlin.Lv@....com>
To:     bpf@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, viro@...iv.linux.org.uk, rdna@...com,
        dvyukov@...gle.com, nicolas.dichtel@...nd.com,
        keescook@...omium.org, masahiroy@...nel.org, maheshb@...gle.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Jianlin.Lv@....com, iecedge@...il.com, nd@....com
Subject: [PATCH bpf-next] bpf: trace jit code when enable BPF_JIT_ALWAYS_ON

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@....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