linux-kernel - Re: [patch 3/3] x86: io-apic - code style cleaning for setup_IO_APIC

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Message-ID: <20080905180126.GA19334@lenovo>
Date:	Fri, 5 Sep 2008 22:01:26 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	yhlu.kernel@...il.com, macro@...ux-mips.org
Subject: Re: [patch 3/3] x86: io-apic - code style cleaning for
	setup_IO_APIC_irqs

[Ingo Molnar - Fri, Sep 05, 2008 at 10:04:47AM +0200]
| 
| * Cyrill Gorcunov <gorcunov@...il.com> wrote:
| 
| > Use a nested level for 'for' cycle and break long lines.
| > For apic_print we should countinue using KERNEL_DEBUG if
| > we have started to.
| 
| > @@ -1521,32 +1521,35 @@ static void __init setup_IO_APIC_irqs(vo
| >  	apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
| >  
| >  	for (apic = 0; apic < nr_ioapics; apic++) {
| > -	for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
| > +		for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
| >  
| > +			idx = find_irq_entry(apic, pin, mp_INT);
| > +			if (idx == -1) {
| 
| hm, i dont really like the super-deep nesting we do here. Could you 
| please split out the iterator into a separate function? That makes the 
| code a lot easier to understand and saves two extra tabs as well for 
| those ugly-looking printk lines.
| 
| 	Ingo
| 

You know it seems we use such a 'cycle on every pin on io-apics'
in several places for now:

io_apic.c
---------
	clear_IO_APIC
	save_mask_IO_APIC_setup
	restore_IO_APIC_setup
	IO_APIC_irq_trigger
	setup_IO_APIC_irqs

I've made a one-line macro for this (like for_all_ioapics_pins)
_but_ it looks much more ugly then this two nested for(;;) :)

If you meant me to make a separate iterator over the pins I think
it will not help a lot - this function is simple enought so the only
problem is too-long-printk-form - maybe just print them on separated
lines instead of tracking apicids? Or it was made in a sake to not
scroll screen too much?

		- Cyrill -
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