* Removing VM_LOCKED from user memory
@ 2007-04-25 12:29 Rolf Eike Beer
0 siblings, 0 replies; only message in thread
From: Rolf Eike Beer @ 2007-04-25 12:29 UTC (permalink / raw)
To: linux-mm; +Cc: linux-kernel
[-- Attachment #1: Type: text/plain, Size: 696 bytes --]
Hi,
I need some assistance handling a large memory segment of a user process.
The user calls the kernel with a address and a length of it's own memory. My
driver will lock this memory using get_user_pages(). This memory is used as
DMA buffer directly from or to user processes.
Everything works fine that far: allocating, DMA mapping, DMA transfers. But I
currently can't get rid of the buffer again. Which function would help me to
get all pages unlocked once the buffer isn't needed anymore?
Is it enough to simply call sys_munlock() from the release and cleanup
functions?
There are no plans to share these mappings between different processes.
Greetings,
Eike
[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 189 bytes --]
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2007-04-25 12:29 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-04-25 12:29 Removing VM_LOCKED from user memory Rolf Eike Beer
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).