linux-kernel - Re: your mail

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Message-ID: <20090119030731.GA28670@parisc-linux.org>
Date:	Sun, 18 Jan 2009 20:07:32 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	"Gao, Yunpeng" <yunpeng.gao@...el.com>
Cc:	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: your mail

On Mon, Jan 19, 2009 at 10:54:02AM +0800, Gao, Yunpeng wrote:
> I have to use 64bit variable in my 2.6.27 kernel NAND driver as below:
> ---------------------------------------------------------------------------
> u64 NAND_capacity;
> unsigned int block_num, block_size;
> ...
> block_num = NAND_capacity / block_size;
> ---------------------------------------------------------------------------
> but it failed when compiling and reports 'undefined reference to `__udivdi3'.

Presumably block_size is a power of two, so you can do:

	block_num = NAND_capacity >> block_shift;

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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