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[PATCH RT 02/14] mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object()

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  [PATCH RT 02/14] mm/zsmalloc: Use get/put_cpu_light in  zs_map_object()/zs_unmap_object() Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 18:50 +0200

#1441549 — [PATCH RT 02/14] mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object()

3.14.72-rt76-rc1 stable review patch.
If anyone has any objections, please let me know.

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

From: Mike Galbraith <umgwanakikbuti@gmail.com>

Otherwise, we get a ___might_sleep() splat.

Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 mm/zsmalloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index c03ca5e9fe15..df9c7a189118 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1037,7 +1037,7 @@ 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 */
@@ -1083,7 +1083,7 @@ 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

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