From cfef930041a5dba4d3c8eb03d9d24fae9b129b08 Mon Sep 17 00:00:00 2001 From: Ard van Breemen Date: Sat, 21 Apr 2007 00:10:28 +0200 Subject: [PATCH] start_kernel: test if irq's got enabled early, barf, and disable them again The calls made by parse_parms to other initialization code might enable interrupts again way too early. Having interrupts on this early can make systems PANIC when they initialize the IRQ controllers (which happens later in the code). This patch detects that irq's are enabled again, barfs about it and disables them again as a safety net. [akpm@osdl.org: cleanups] Signed-off-by: Ard van Breemen Signed-off-by: Andrew Morton Signed-off-by: Adrian Bunk --- init/main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/init/main.c b/init/main.c index 4c194c47395f..5edd3013d810 100644 --- a/init/main.c +++ b/init/main.c @@ -477,6 +477,11 @@ asmlinkage void __init start_kernel(void) parse_args("Booting kernel", command_line, __start___param, __stop___param - __start___param, &unknown_bootoption); + if (!irqs_disabled()) { + printk(KERN_WARNING "start_kernel(): bug: interrupts were " + "enabled *very* early, fixing it\n"); + local_irq_disable(); + } sort_main_extable(); trap_init(); rcu_init(); -- 2.39.5