Commit b664e255 authored by Tiezhu Yang's avatar Tiezhu Yang Committed by Daniel Borkmann
Browse files

bpf: Add some description about BPF_JIT_ALWAYS_ON in Kconfig 



When CONFIG_BPF_JIT_ALWAYS_ON is enabled, /proc/sys/net/core/bpf_jit_enable
is permanently set to 1 and setting any other value than that will return
failure.

Add the above description in the help text of config BPF_JIT_ALWAYS_ON, and
then we can distinguish between BPF_JIT_ALWAYS_ON and BPF_JIT_DEFAULT_ON.

Signed-off-by: default avatarTiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarSong Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/1645523826-18149-2-git-send-email-yangtiezhu@loongson.cn
parent 43429ea7

kernel/bpf/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -58,6 +58,10 @@ config BPF_JIT_ALWAYS_ON 
	  Enables BPF JIT and removes BPF interpreter to avoid speculative

	  execution of BPF instructions by the interpreter.



	  When CONFIG_BPF_JIT_ALWAYS_ON is enabled, /proc/sys/net/core/bpf_jit_enable

	  is permanently set to 1 and setting any other value than that will

	  return failure.



config BPF_JIT_DEFAULT_ON

	def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON

	depends on HAVE_EBPF_JIT && BPF_JIT