linux-kernel - Re: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine

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Date:	Fri, 22 Dec 2006 11:10:58 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Ard -kwaak- van Breemen <ard@...egraafnet.nl>
Cc:	"Zhang, Yanmin" <yanmin.zhang@...el.com>,
	Chuck Ebbert <76306.1226@...puserve.com>,
	Yinghai Lu <yinghai.lu@....com>, take@...ero.it,
	agalanin@...a.ru, linux-kernel@...r.kernel.org,
	bugme-daemon@...zilla.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine

On Fri, 22 Dec 2006 15:16:55 +0100
Ard -kwaak- van Breemen <ard@...egraafnet.nl> wrote:

> On Fri, Dec 22, 2006 at 03:00:59PM +0100, Ard -kwaak- van Breemen wrote:
> >     262         if (!irqs_disabled()) printk(__FILE__ "%s(): blaat: interrupts were enabled early@%d\n",__FUNCTION__,__LINE__);
> >     263 
> >     264         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
> ------------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^
> which does a         if (pci_find_device(PCI_ANY_ID, PCI_ANY_ID,
> in include/asm-i386/ide.h
> 
> which should be really the part that does the irq enabling.

doh, I missed down_read():

--- a/lib/rwsem-spinlock.c~down_write-preserve-local-irqs
+++ a/lib/rwsem-spinlock.c
@@ -129,13 +129,14 @@ void fastcall __sched __down_read(struct
 {
 	struct rwsem_waiter waiter;
 	struct task_struct *tsk;
+	unsigned long flags;
 
-	spin_lock_irq(&sem->wait_lock);
+	spin_lock_irqsave(&sem->wait_lock, flags);
 
 	if (sem->activity >= 0 && list_empty(&sem->wait_list)) {
 		/* granted */
 		sem->activity++;
-		spin_unlock_irq(&sem->wait_lock);
+		spin_unlock_irqrestore(&sem->wait_lock, flags);
 		goto out;
 	}
 
@@ -150,7 +151,7 @@ void fastcall __sched __down_read(struct
 	list_add_tail(&waiter.list, &sem->wait_list);
 
 	/* we don't need to touch the semaphore struct anymore */
-	spin_unlock_irq(&sem->wait_lock);
+	spin_unlock_irqrestore(&sem->wait_lock, flags);
 
 	/* wait to be given the lock */
 	for (;;) {
@@ -195,13 +196,14 @@ void fastcall __sched __down_write_neste
 {
 	struct rwsem_waiter waiter;
 	struct task_struct *tsk;
+	unsigned long flags;
 
-	spin_lock_irq(&sem->wait_lock);
+	spin_lock_irqsave(&sem->wait_lock, flags);
 
 	if (sem->activity == 0 && list_empty(&sem->wait_list)) {
 		/* granted */
 		sem->activity = -1;
-		spin_unlock_irq(&sem->wait_lock);
+		spin_unlock_irqrestore(&sem->wait_lock, flags);
 		goto out;
 	}
 
@@ -216,7 +218,7 @@ void fastcall __sched __down_write_neste
 	list_add_tail(&waiter.list, &sem->wait_list);
 
 	/* we don't need to touch the semaphore struct anymore */
-	spin_unlock_irq(&sem->wait_lock);
+	spin_unlock_irqrestore(&sem->wait_lock, flags);
 
 	/* wait to be given the lock */
 	for (;;) {
_

-
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