RE: Disabling interrupts in 2.4.x

["Boerner, Brian" <Brian_Boerner@adaptec.com>]

It's a UP configured system.

-bmb-


> -----Original Message-----
> From: Andi Kleen [mailto:ak@suse.de]
> Sent: Monday, December 18, 2000 3:18 PM
> To: Boerner, Brian
> Cc: 'linux-kernel@vger.redhat.com'
> Subject: Re: Disabling interrupts in 2.4.x
> 
> 
> > The only thing I am sure of is that interrupts are simply 
> not disabled.
> 
> They are only disabled on the local CPU, they could still 
> occur on other 
> CPUs. This is not different from 2.2.
> 
> > 
> > I've also looked at some other scsi drivers that are 
> disabling interrupts
> > and they appear to be making similar calls to spin_lock_irqsave.
> > 
> > Does anyone have any suggestions for debugging this? Is 
> there a call that
> > can be made to find out if interrupts are actually disabled?
> 
> unsigned flag; 
> asm volatile("pushfl ; popfl %0" : "=r" (flag)); 
> printk(KERN_DEBUG "local interrupts are %s\n", (flag & 
> (1<<9)) ? "enabled" : "disabled"); 
> 
> -Andi
> 
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