fork: clean-up naming of vm_stack/vm_struct variables in vmap stacks code

There are two data types: "struct vm_struct" and "struct vm_stack" that
have the same local variable names: vm_stack, or vm, or s, which makes the
code confusing to read.

Change the code so the naming is consistent:

struct vm_struct is always called vm_area
struct vm_stack is always called vm_stack

One change altering vfree(vm_stack) to vfree(vm_area->addr) may look like
a semantic change but it is not: vm_area->addr points to the vm_stack. 
This was done to improve readability.

[[email protected]: rebased and added new users of the variable names, address review comments]
Link: https://lore.kernel.org/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Pasha Tatashin <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Acked-by: Mike Rapoport (Microsoft) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions