From c4a68306b9c0939b3facdad2cc5e34d660ff463a Mon Sep 17 00:00:00 2001 From: Ard van Breemen Date: Fri, 5 Jan 2007 16:36:19 -0800 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: Linus Torvalds --- init/main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/init/main.c b/init/main.c index 2b1cdaab45e..bc27d72bbb1 100644 --- a/init/main.c +++ b/init/main.c @@ -538,6 +538,11 @@ 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(); -- cgit v1.2.3