From b47613da3b71ca59cc6924bad2d74974f86fab92 Mon Sep 17 00:00:00 2001 From: Xiang Wang Date: Fri, 6 Sep 2019 11:56:09 +0800 Subject: [PATCH] arch/riscv: disable excess harts before picking main boot hart Harts with id greater than or equal to CONFIG_NR_CPUS need to be disabled. But the kernel can pick any hart as the main hart. So, before picking the main hart, the kernel must disable harts with ids greater than or equal to CONFIG_NR_CPUS. Signed-off-by: Xiang Wang Reviewed-by: Palmer Dabbelt Reviewed-by: Anup Patel [paul.walmsley@sifive.com: updated to apply; cleaned up patch description] Signed-off-by: Paul Walmsley --- arch/riscv/kernel/head.S | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index 15a9189f91ad..72f89b7590dd 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -63,6 +63,11 @@ _start_kernel: li t0, SR_FS csrc CSR_SSTATUS, t0 +#ifdef CONFIG_SMP + li t0, CONFIG_NR_CPUS + bgeu a0, t0, .Lsecondary_park +#endif + /* Pick one hart to run the main boot sequence */ la a3, hart_lottery li a2, 1 @@ -154,9 +159,6 @@ relocate: .Lsecondary_start: #ifdef CONFIG_SMP - li a1, CONFIG_NR_CPUS - bgeu a0, a1, .Lsecondary_park - /* Set trap vector to spin forever to help debug */ la a3, .Lsecondary_park csrw CSR_STVEC, a3