linux-kernel - Re: [PATCH -queue v0 4/6] [loongson] add basic fuloong2f support

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Date:	Thu, 05 Nov 2009 22:44:22 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	linux-mips@...ux-mips.org, LKML <linux-kernel@...r.kernel.org>,
	huhb@...ote.com, yanh@...ote.com, Zhang Le <r0bertz@...too.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nicholas Mc Guire <der.herr@...r.at>, zhangfx@...ote.com,
	liujl@...ote.com
Subject: Re: [PATCH -queue v0 4/6] [loongson] add basic fuloong2f support

Hi,

On Thu, 2009-11-05 at 14:16 +0100, Ralf Baechle wrote:
> > +
> > +	if ((LOONGSON_INTISR & LOONGSON_INTEN) & LOONGSON_INT_BIT_INT0) {
> > +		imr = inb(0x21) | (inb(0xa1) << 8);
> > +		isr = inb(0x20) | (inb(0xa0) << 8);
> > +		isr &= ~0x4;	/* irq2 for cascade */
> > +		isr &= ~imr;
> > +		irq = ffs(isr) - 1;
> > +	}
> 
> Any reason why you're not using i8259_irq() from <asm/i8259.h> here?
> That function not only gets the locking right, it also minimizes the number
> of accesses to the i8259 - which even on modern silicon can be stuningly
> slow.
> 

Seems there are some differences between here and the i8259_irq(), I
forget the details, perhaps "Yan Hua" can give a detail explaination.

> > +#if 1
> > +	pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &val);
> > +	printk(KERN_INFO "cs5536 acc latency 0x%x\n", val);
> > +	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xc0);
> > +#endif
> 
> Seems like left over debug code?
> 
> > +	return;
> > +}
> 
> And a useless return statement at the end of a void function.
> 

Okay, will remove them later.

Regards,
	Wu Zhangjin

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