linux-kernel - how to fix nand driver build breakage

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Date:	Mon, 19 Jan 2009 13:25:04 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Gao, Yunpeng" <yunpeng.gao@...el.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: how to fix nand driver build breakage

> Hi all,
> 
> 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'.
> 
> Does any idea about this? I need to include some special head file or change something in Kconfig?
> 
> BTW, the environment is Fedora Core 9, gcc 4.3.0. 

Couldn't you use do_div()?



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