From a32eddf2bb52caa5ebab4c5e50bd9f45162d8c13 Mon Sep 17 00:00:00 2001 From: Huacai Chen Date: Thu, 20 Nov 2025 14:42:05 +0800 Subject: [PATCH] LoongArch: Mask all interrupts during kexec/kdump [ Upstream commit 863a320dc6fd7c855f47da4bb82a8de2d9102ea2 ] If the default state of the interrupt controllers in the first kernel don't mask any interrupts, it may cause the second kernel to potentially receive interrupts (which were previously allocated by the first kernel) immediately after a CPU becomes online during its boot process. These interrupts cannot be properly routed, leading to bad IRQ issues. This patch calls machine_kexec_mask_interrupts() to mask all interrupts during the kexec/kdump process. Signed-off-by: Tianyang Zhang Signed-off-by: Huacai Chen Signed-off-by: Sasha Levin --- arch/loongarch/kernel/machine_kexec.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/loongarch/kernel/machine_kexec.c b/arch/loongarch/kernel/machine_kexec.c index 30aa420610a0..e50c9a81ff1a 100644 --- a/arch/loongarch/kernel/machine_kexec.c +++ b/arch/loongarch/kernel/machine_kexec.c @@ -249,6 +249,7 @@ void machine_crash_shutdown(struct pt_regs *regs) #ifdef CONFIG_SMP crash_smp_send_stop(); #endif + machine_kexec_mask_interrupts(); cpumask_set_cpu(crashing_cpu, &cpus_in_crash); pr_info("Starting crashdump kernel...\n"); @@ -286,6 +287,7 @@ void machine_kexec(struct kimage *image) /* We do not want to be bothered. */ local_irq_disable(); + machine_kexec_mask_interrupts(); pr_notice("EFI boot flag 0x%lx\n", efi_boot); pr_notice("Command line at 0x%lx\n", cmdline_ptr);