linux-kernel - BUG? linux-mips flush_dcache

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Message-Id: <20091016141719.de606482.minchan.kim@barrios-desktop>
Date:	Fri, 16 Oct 2009 14:17:19 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>,
	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	linux-mips <linux-mips@...ux-mips.org>,
	Chungki woo <chungki.woo@...il.com>
Subject: BUG? linux-mips flush_dcache_page

Hi, Ralf. 

I suffered form data consistency problem. 

Many code of kernel fs usually allocate high page and flush.
But flush_dcache_page of mips checks PageHighMem to avoid flush
so that data consistency is broken, I think. 

I found it's by you and Atsushi-san on 585fa724. 
Why do we need the check?
Could you elaborte please? 

-- 
Kind regards,
Minchan Kim
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