linux-kernel - Warning with asm-generic/div64.h

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Message-ID: <007801cbead6$1984b6e0$4c8e24a0$@mprc.pku.edu.cn>
Date:	Fri, 25 Mar 2011 18:19:15 +0800
From:	"Guan Xuetao" <gxt@...c.pku.edu.cn>
To:	"Arnd Bergmann" <arnd@...db.de>
Cc:	<linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>
Subject: Warning with asm-generic/div64.h

Hi, Arnd:

Following warning is generated when using <asm-generic/div64.h>

kernel/power/hibernate.c: In function 'swsusp_show_speed':
kernel/power/hibernate.c:227: warning: comparison of distinct pointer types lacks a cast

After expanding the do_div() macro, the problem line is:

	(void)(((typeof((n)) *)0) == ((uint64_t *)0));

while the type of n is s64.

I am puzzled with the usage of the problem line.

And how to correct it?

Guan Xuetao

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