handling variable size allocations

[zolutal]

how could kcalloc, kmalloc_array, vmalloc, etc... be better supported?

it seems like a lot of these allocations are something like:

vmalloc(sizeof(struct _) [*+] n, flags)
kcalloc(n, sizeof(struct _), flags)
kmalloc_array(n, sizeof(struct _), flags)

which for cases where n is constant it might be feasible to do some constant evaluation, when n is not constant though I'm not sure how these could be handled