From: Ard van Breemen Date: Sat, 6 Jan 2007 00:36:19 +0000 (-0800) Subject: [PATCH] start_kernel: test if irq's got enabled early, barf, and disable them again X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c4a68306b9c0939b3facdad2cc5e34d660ff463a;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git [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 --- diff --git a/init/main.c b/init/main.c index 2b1cdaab45e6..bc27d72bbb19 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();