From: Andrew Morton <akpm@digeo.com>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: inaky.perez-gonzalez@intel.com, linux-mm@kvack.org
Subject: Re: Silly question: How to map a user space page in kernel space?
Date: Wed, 26 Feb 2003 00:33:34 -0800 [thread overview]
Message-ID: <20030226003334.7e85d5b2.akpm@digeo.com> (raw)
In-Reply-To: <9860000.1046238956@[10.10.2.4]>
"Martin J. Bligh" <mbligh@aracnet.com> wrote:
>
> But be aware that pagefaulting inside kmap_atomic is bad - you can get
> blocked and rescheduled, so touching user pages, etc is dangerous.
That's true in 2.4. In 2.5 a copy_foo_user() inside kmap_atomic()
will just return a short copy while remaining atomic.
See mm/filemap.c:filemap_copy_from_user()
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next prev parent reply other threads:[~2003-02-26 8:33 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <A46BBDB345A7D5118EC90002A5072C780A7D57E6@orsmsx116.jf.intel.com >
2003-02-26 4:44 ` Perez-Gonzalez, Inaky
2003-02-26 5:55 ` Martin J. Bligh
2003-02-26 8:33 ` Andrew Morton [this message]
2003-02-26 19:03 ` Martin J. Bligh
2003-02-26 12:40 ` Mel Gorman
2003-02-26 19:04 Perez-Gonzalez, Inaky
-- strict thread matches above, loose matches on Subject: below --
2003-02-26 18:57 Perez-Gonzalez, Inaky
2003-02-26 19:01 ` Mel Gorman
[not found] <A46BBDB345A7D5118EC90002A5072C780A7D57BB@orsmsx116.jf.intel.com >
2003-02-26 3:06 ` Perez-Gonzalez, Inaky
2003-02-26 4:14 ` Martin J. Bligh
2003-02-26 4:39 ` Robert Love
2003-02-21 22:49 Perez-Gonzalez, Inaky
[not found] <A46BBDB345A7D5118EC90002A5072C780A7D5194@orsmsx116.jf.intel.com >
2003-02-21 22:06 ` Perez-Gonzalez, Inaky
2003-02-21 22:22 ` Martin J. Bligh
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