Arrays of variable length

[Tomas Winkler]

Sparse complains for arrays declared with variable length

'warning: Variable length array is used'

Prior to c99 this was not allowed but lgcc (c99) doesn't have problem
with that  https://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html.
And also Linux kernel compilation with W=1 doesn't complain.

Since sparse is used extensively would like to ask what is the correct
usage of arrays of variable length
within Linux Kernel.


Thanks
Tomas