From: David Miller <davem@davemloft.net>
To: mattjreimer@gmail.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: D-cache aliasing issue in cow_user_page
Date: Tue, 05 Dec 2006 13:24:12 -0800 (PST) [thread overview]
Message-ID: <20061205.132412.116353924.davem@davemloft.net> (raw)
In-Reply-To: <f383264b0612042338y2609dd76w8ba562394800bbd0@mail.gmail.com>
From: "Matt Reimer" <mattjreimer@gmail.com>
Date: Mon, 4 Dec 2006 23:38:13 -0800
> In light of James Bottomsley's commit[1] declaring that kmap() and
> friends now have to take care of coherency issues, is the patch "mm:
> D-cache aliasing issue in cow_user_page"[2] correct, or could it
> potentially cause a slowdown by calling flush_dcache_page() a second
> time (i.e. once in an architecture-specific kmap() implementation, and
> once in cow_user_page())?
kmap() is a NOP unless HIGHMEM is configured.
Therefore, it cannot possibly take care of D-cache aliasing issues
across the board.
next prev parent reply other threads:[~2006-12-05 21:24 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-05 7:38 Matt Reimer
2006-12-05 21:24 ` David Miller [this message]
2006-12-06 0:57 ` Matt Reimer
2006-12-06 0:59 ` David Miller
2006-12-06 7:04 ` Matt Reimer
2006-12-06 21:19 ` Matt Reimer
2006-12-07 0:46 ` David Miller
2006-12-07 6:20 ` Matt Reimer
2006-12-07 7:22 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2006-10-17 9:15 [PATCH] mm:D-cache " Dmitriy Monakhov
2006-10-19 6:33 ` Andrew Morton
2006-10-19 7:00 ` David Miller
2006-10-19 7:17 ` Andrew Morton
2006-10-19 7:22 ` David Miller
2006-10-19 7:41 ` Andrew Morton
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