From: "David S. Miller" <davem@redhat.com>
To: Matthew Wilcox <willy@debian.org>
Cc: sct@redhat.com, willy@debian.org, santosh.abraham@hp.com,
randolph@tausq.org, parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] Fwd: Problems with raw interface.
Date: Fri, 26 Sep 2003 05:38:05 -0700 [thread overview]
Message-ID: <20030926053805.63bda07a.davem@redhat.com> (raw)
In-Reply-To: <20030926122023.GH24824@parcelfarce.linux.theplanet.co.uk>
On Fri, 26 Sep 2003 13:20:23 +0100
Matthew Wilcox <willy@debian.org> wrote:
> OK, so it *might* be a page cache page, but isn't necessarily. So we
> need to call *both* flush_dcache_page() and flush_cache_range(), right?
I'm starting to think that flush_dcache_page() needs to take care
of this.
Santosh remarked that flush_dcache_page() doesn't get the user virtual
address, but that is not needed. From the page you can walk the mmap()s
and flush the mapping in each address space it is contained within.
And you absolutely must flush each address space, not just the one currently
doing the raw I/O request.
In that light, doing a flush_cache_range() with a specific VMA (2.6.x)
or MM (2.4.x) is totally illogical here.
next prev parent reply other threads:[~2003-09-26 12:51 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-25 10:38 [parisc-linux] Fwd: Problems with raw interface Santosh Abraham
2003-09-25 10:50 ` Randolph Chung
2003-09-25 11:19 ` Santosh Abraham
2003-09-25 14:26 ` Matthew Wilcox
2003-09-26 1:08 ` David S. Miller
2003-09-26 11:24 ` Matthew Wilcox
2003-09-26 11:20 ` David S. Miller
2003-09-26 11:57 ` Stephen C. Tweedie
2003-09-26 11:48 ` David S. Miller
2003-09-26 12:20 ` Matthew Wilcox
2003-09-26 12:38 ` David S. Miller [this message]
2003-09-26 13:11 ` SANTOSH ABRAHAM
2003-09-26 12:56 ` David S. Miller
2003-09-26 13:29 ` Matthew Wilcox
2003-09-26 13:21 ` David S. Miller
2003-09-26 14:09 ` Matthew Wilcox
2003-09-26 14:04 ` David S. Miller
2003-09-26 14:30 ` Matthew Wilcox
2003-09-26 14:20 ` David S. Miller
2003-09-26 14:42 ` Stephen C. Tweedie
2003-09-26 14:26 ` Stephen C. Tweedie
2003-09-26 11:47 ` Santosh Abraham
2003-09-26 10:42 ` Santosh Abraham
2003-09-26 10:34 ` David S. Miller
2003-09-26 12:12 ` Santosh Abraham
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