linux-kernel - Re: [git patches] libata fixes

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Message-ID: <4970D5B0.5010209@ru.mvista.com>
Date:	Fri, 16 Jan 2009 21:45:04 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git patches] libata fixes

Hello.

Andrew Morton wrote:

>>+static unsigned int ns_to_tim_reg(unsigned int tim_mult, unsigned int nsecs)
>>+{
>>+	unsigned int val;
>>+
>>+	/*
>>+	 * Compute # of eclock periods to get desired duration in
>>+	 * nanoseconds.
>>+	 */
>>+	val = DIV_ROUND_UP(nsecs * (octeon_get_clock_rate() / 1000000),
>>+			  1000 * tim_mult);
>>+
>>+	return val;
>>+}

> There's great potential for overflows here, but I couldn't be bothered
> picking through it.  Are we sure that it's watertight?

> There's a 64-bit divide in there.  Will it link on 32-bit platforms?

> Or is this all 64-bit-only code?

> wtf is an octeon anyway?  (greps).  Some MIPS thing.  I guess it's
> 64-bit-only.

    Yes, it's multicore MIPS64. AFAIK, it should be able to run 32-bit kernel 
(don't think that it's really worth it).

WBR, Sergei
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