This sort of thing is best handled on the stack, but, of course, that has
critical flaws. A way to deal with this is to create a per-cpu kmalloc'ed
dynamically extended stack from which memory can be allocated. Then, most
allocations/deallocations are done in O(1) and memory fragmentation due to
lots of small allocation is avoided.
Furthermore, with the help of macros, memory leaks due to mid-function returns
and such can be completely avoided.
A survey of kernel code revealed a number of places where this methodology can
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