From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: linux-next: origin tree build failure
Date: Wed, 15 Oct 2008 21:57:19 -0700 (PDT)
Message-ID: <20081015.215719.204317426.davem@davemloft.net>
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From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Thu, 16 Oct 2008 11:35:31 +1100

> Hi Linus,
> 
> Today's linux-next build (x86_64 allmodconfig) failed like this:
> 
> drivers/rtc/rtc-m48t35.c: In function 'm48t35_read_time':
> drivers/rtc/rtc-m48t35.c:59: error: implicit declaration of function 'readb'
> drivers/rtc/rtc-m48t35.c:60: error: implicit declaration of function 'writeb'

This part looks simply like a missing asm/io.h include.

MIPS is getting it implicitly somehow.