From: Manfred Spraul <manfred@colorfullife.com>
To: Matthew Wilcox <willy@debian.org>,
"David S. Miller" <davem@redhat.com>,
linux-kernel@vger.kernel.org, Russell King <rmk@arm.linux.org.uk>,
Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] shmem missing cache flush
Date: Mon, 28 Oct 2002 17:50:41 +0100 [thread overview]
Message-ID: <3DBD6AE1.8040403@colorfullife.com> (raw)
Is it permitted to call flush_dcache_page() on pages that are not in the
page cache?
The documentation is ambiguous, it only mentions how archs can handle
dcache aliases for page cache users.
What about the user space accesses that kmap user space pages directly,
without copy_*_user?
For example:
- ptrace
- disk transfers that end up calling __bio_kmap() - RAID-5, ide error
handling.
Could be from irq context!
- hole handling for O_DIRECT file access.
In all 3 cases, the target could be outside of the page cache.
--
Manfred
next reply other threads:[~2002-10-28 16:44 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-28 16:50 Manfred Spraul [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-10-16 18:26 [PATCH] shmem missing cache flush Matthew Wilcox
2002-10-16 23:57 ` Hugh Dickins
2002-10-16 23:58 ` David S. Miller
2002-10-17 0:19 ` Russell King
2002-10-17 0:16 ` David S. Miller
2002-10-21 15:04 ` Alan Cox
2002-10-21 15:21 ` David S. Miller
2002-10-21 16:12 ` Alan Cox
2002-10-28 14:10 ` David S. Miller
2002-10-28 14:32 ` Matthew Wilcox
2002-10-28 14:26 ` David S. Miller
2002-10-28 16:36 ` Matthew Wilcox
2002-10-28 16:55 ` David S. Miller
2002-10-28 17:06 ` Matthew Wilcox
2002-10-28 16:58 ` David S. Miller
2002-10-29 21:52 ` Matthew Wilcox
2002-10-28 17:08 ` Alan Cox
2002-10-28 16:52 ` Matthew Wilcox
2002-10-28 14:35 ` Hugh Dickins
2002-10-28 14:26 ` David S. Miller
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