kernel memory usage any restrictions?

[cranium2003 <cranium2003@yahoo.com>]

hello,
              Is there any restricition on using
kernel's memory? also if i require to use some kernel
memory say 625kB by allocating that in GFP_ATOMIC mode
flag, what will be the side effects on kernel memory
if i use that 625kB memory available from kernel
memory for my kernel source code additions to kernel?
I require answer with respect to 2.4 and 2.6 kernel.
regards,
cranium. 

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