linux-kernel - [PATCH bpf-next] bpf: Allow bpf_jit_enable = 2 with BPF_JIT_ALWAYS

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Message-Id: <1524644322-9263-1-git-send-email-leo.yan@linaro.org>
Date:   Wed, 25 Apr 2018 16:18:42 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kirill Tkhai <ktkhai@...tuozzo.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH bpf-next] bpf: Allow bpf_jit_enable = 2 with BPF_JIT_ALWAYS_ON config

After enabled BPF_JIT_ALWAYS_ON config, bpf_jit_enable always equals to
1; it is impossible to set 'bpf_jit_enable = 2' and the kernel has no
chance to call bpf_jit_dump().

This patch relaxes bpf_jit_enable range to [1..2] when kernel config
BPF_JIT_ALWAYS_ON is enabled so can invoke jit dump.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 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 b1a2c5e..6a39b22 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -371,7 +371,7 @@ static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
 		.proc_handler	= proc_dointvec_minmax_bpf_enable,
 # ifdef CONFIG_BPF_JIT_ALWAYS_ON
 		.extra1		= &one,
-		.extra2		= &one,
+		.extra2		= &two,
 # else
 		.extra1		= &zero,
 		.extra2		= &two,
-- 
1.9.1