tree 9e8b07047080fbdb4f4c8f1554d5208570e64fe2
parent 1880d93b80acc3171850e9df5048bcb26b75c2f5
author Tejun Heo <tj@kernel.org> 1236354249 +0900
committer Tejun Heo <tj@kernel.org> 1236354249 +0900

percpu: move chunk area map extension out of area allocation

Impact: code reorganization for later changes

Separate out chunk area map extension into a separate function -
pcpu_extend_area_map() - and call it directly from pcpu_alloc() such
that pcpu_alloc_area() is guaranteed to have enough area map slots on
invocation.

With this change, pcpu_alloc_area() does only area allocation and the
only failure mode is when the chunk doens't have enough room, so
there's no need to distinguish it from memory allocation failures.
Make it return -1 on such cases instead of hacky -ENOSPC.

Signed-off-by: Tejun Heo <tj@kernel.org>