[PATCH RT 02/15] mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object()

From: Steven Rostedt
Date: Tue Jul 12 2016 - 10:29:53 EST


3.18.36-rt38-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Mike Galbraith <umgwanakikbuti@xxxxxxxxx>

Otherwise, we get a ___might_sleep() splat.

Signed-off-by: Mike Galbraith <umgwanakikbuti@xxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
mm/zsmalloc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 839a48c3ca27..1db2077e38f7 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1127,7 +1127,7 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle,
class = &pool->size_class[class_idx];
off = obj_idx_to_offset(page, obj_idx, class->size);

- area = &get_cpu_var(zs_map_area);
+ area = per_cpu_ptr(&zs_map_area, get_cpu_light());
area->vm_mm = mm;
if (off + class->size <= PAGE_SIZE) {
/* this object is contained entirely within a page */
@@ -1173,7 +1173,7 @@ void zs_unmap_object(struct zs_pool *pool, unsigned long handle)

__zs_unmap_object(area, pages, off, class->size);
}
- put_cpu_var(zs_map_area);
+ put_cpu_light();
}
EXPORT_SYMBOL_GPL(zs_unmap_object);

--
2.8.1