Kernel tempory memory alloc

[James Courtier-Dutton <James@superbug.demon.co.uk>]

Hi,

I am going to implement an IOCTL for a particular driver.
Previously I might have used the stack to store the request/response in 
while using copy_to/from_user, but with the 4K stack limit, I must 
consider other alternatives.
The IOCTL will be a simple request/response type, so the memory 
allocation will be for a very short time. Which is the correct memory 
api to use when allocating short term temporary memory in the kernel.
Alternatively, is there a way to handle this by simply moving a page 
from user space to kernel space and then back to user space again?
Thus reducing the amount of memcpy.

James

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