SSE2 and hence lfence are architectural in x86-64 and no need to check whether they're supported in CPU. SSE2's CPUID flag is still set to maintain backward compatibility with older code or code shared with x86, but bpf_jit_comp.c is compiled under x86-64 exclusively so the check is redundant. Signed-off-by: Jie Meng <jmeng@xxxxxx> --- arch/x86/net/bpf_jit_comp.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index d09c54f3d2e0..b2124521305e 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -1289,8 +1289,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, u8 *rw_image /* speculation barrier */ case BPF_ST | BPF_NOSPEC: - if (boot_cpu_has(X86_FEATURE_XMM2)) - EMIT_LFENCE(); + EMIT_LFENCE(); break; /* ST: *(u8*)(dst_reg + off) = imm */ -- 2.30.2
