[PATCH bpf-next v2] bpf,x64: Remove unnecessary check on existence of SSE2

[Jie Meng <jmeng@fb.com>]

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@fb.com>
---
 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