From 2e30960097f6bc1a0dff89c0bcbc4138e3506d7c Mon Sep 17 00:00:00 2001 From: Jie Meng Date: Wed, 5 Oct 2022 10:00:39 -0700 Subject: [PATCH] bpf, x64: Remove unnecessary check on existence of SSE2 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 Signed-off-by: Daniel Borkmann Acked-by: KP Singh Link: https://lore.kernel.org/bpf/20221005170039.3936894-1-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 99620428ad78..0abd082786e7 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -1226,8 +1226,7 @@ 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 */ -- 2.11.0