linux-kernel - Re: [PATCH] x86: I/O APIC: Always report how the timer has been set up

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Date:	Fri, 18 Jul 2008 14:22:27 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: I/O APIC: Always report how the timer has been
	set up


* Maciej W. Rozycki <macro@...ux-mips.org> wrote:

>  Following recent (and less so) issues with the 8254 timer when routed 
> through the I/O or local APIC, always report which configurations have 
> been tried and which one has been set up eventually.  This is so that 
> logs posted by people for some other reason can be used as a 
> cross-reference when investigating any possible future problems.
> 
>  The change unifies messages printed on 32-bit and 64-bit platforms 
> and adds trailing newlines (removes leading ones), so that proper log 
> level annotation can be used and any possible interspersed output will 
> not cause a mess.
> 
>  I have chosen to use apic_printk(APIC_QUIET, ...) rather than 
> printk(...) so that the distinction of these messages is maintained 
> making possible future decisions about changes in this area easier.  A 
> change posted separately making apic_verbosity unsigned removes any 
> extra code that would otherwise be generated as a result of this 
> design decision.
> 
> Signed-off-by: Maciej W. Rozycki <macro@...ux-mips.org>

applied to tip/x86/apic, thanks Maciej.

ported this portion ontop of the write-around-removal patch:

>  	apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector);	/* Fixed mode */
>  	enable_8259A_irq(0);
>  
>  	if (timer_irq_works()) {
> -		printk(" works.\n");
> +		apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
>  		goto out;
>  	}
>  	disable_8259A_irq(0);
>  	apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
> -	printk(" failed.\n");
> +	apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
>  
> -	printk(KERN_INFO "...trying to set up timer as ExtINT IRQ...");
> +	apic_printk(APIC_QUIET, KERN_INFO
> +		    "...trying to set up timer as ExtINT IRQ...\n");
>  
>  	init_8259A(0);
>  	make_8259A_irq(0);

	Ingo
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