On non-SMP systems, there is no "per-CPU" data, it's just global data. So in such case just don't do this_cpu_off-based per-CPU address adjustment. Reported-by: kernel test robot <lkp@xxxxxxxxx> Closes: https://lore.kernel.org/oe-kbuild-all/202404040951.d4CUx5S6-lkp@xxxxxxxxx/ Fixes: 7bdbf7446305 ("bpf: add special internal-only MOV instruction to resolve per-CPU addrs") Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx> --- arch/x86/net/bpf_jit_comp.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index af89dd117dce..964e8154da66 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -1383,15 +1383,14 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, u8 *rw_image EMIT3(0x0F, 0x44, add_2reg(0xC0, AUX_REG, dst_reg)); break; } else if (insn_is_mov_percpu_addr(insn)) { - u32 off = (u32)(unsigned long)&this_cpu_off; - /* mov <dst>, <src> (if necessary) */ EMIT_mov(dst_reg, src_reg); - +#ifdef CONFIG_SMP /* add <dst>, gs:[<off>] */ EMIT2(0x65, add_1mod(0x48, dst_reg)); EMIT3(0x03, add_1reg(0x04, dst_reg), 0x25); - EMIT(off, 4); + EMIT((u32)(unsigned long)&this_cpu_off, 4); +#endif break; } fallthrough; -- 2.43.0
