[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 <redacted>
---
 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

On Fri, Dec 31, 2021 at 7:20 AM Hou Tao [off-list ref] wrote:

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 <redacted>

That was discussed in the past:
https://lore.kernel.org/bpf/20210326124030.1138964-1-Jianlin.Lv@arm.com/
The old point stands.