From a9281060e889df67249949013c22858135068738 Mon Sep 17 00:00:00 2001 From: Ard van Breemen Date: Thu, 11 Jan 2007 10:21:52 -0500 Subject: [PATCH] [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 Signed-off-by: Chris Wright --- init/main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/init/main.c b/init/main.c index 36f608a7cfba..b9f78438dfdd 100644 --- a/init/main.c +++ b/init/main.c @@ -525,6 +525,11 @@ 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