percpu: use negative for auto for pcpu_setup_first_chunk() arguments

Impact: argument semantic cleanup

In pcpu_setup_first_chunk(), zero @unit_size and @dyn_size meant
auto-sizing.  It's okay for @unit_size as 0 doesn't make sense but 0
dynamic reserve size is valid.  Alos, if arch @dyn_size is calculated
from other parameters, it might end up passing in 0 @dyn_size and
malfunction when the size is automatically adjusted.

This patch makes both @unit_size and @dyn_size ssize_t and use -1 for
auto sizing.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index a0b4ea2a3354..a96fc53bbd62 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -117,8 +117,9 @@ typedef struct page * (*pcpu_get_page_fn_t)(unsigned int cpu, int pageno);
 typedef void (*pcpu_populate_pte_fn_t)(unsigned long addr);
 
 extern size_t __init pcpu_setup_first_chunk(pcpu_get_page_fn_t get_page_fn,
-                                        size_t static_size, size_t unit_size,
-                                        size_t dyn_size, void *base_addr,
+                                        size_t static_size,
+                                        ssize_t unit_size, ssize_t dyn_size,
+                                        void *base_addr,
                                         pcpu_populate_pte_fn_t populate_pte_fn);
 
 /*