On 2025/2/19 09:47, Alexei Starovoitov wrote: > On Thu, Feb 13, 2025 at 8:19 AM Leon Hwang <leon.hwang@xxxxxxxxx> wrote: >> >> >> +#ifdef CONFIG_SMP > > What happens on !SMP ? > I think the code assumes that the verifier will adjust ld_imm64 > with percpu insn. > On !SMP ld_imm64 will be pointing where? If !SMP, ld_imm64 correctly loads the address from array->pptrs[0]. Therefore, adding a percpu instruction is unnecessary for !SMP, although it would still function correctly in that case. For SMP, a percpu instruction is inserted after ld_imm64 to ensure proper handling. Thanks, Leon
