[patch] mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object()

[patch] mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object()

[Mike Galbraith]

Otherwise, we get a ___might_sleep() splat.

Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
---
 mm/zsmalloc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1292,7 +1292,7 @@ void *zs_map_object(struct zs_pool *pool
 	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 */
@@ -1345,7 +1345,7 @@ void zs_unmap_object(struct zs_pool *poo
 
 		__zs_unmap_object(area, pages, off, class->size);
 	}
-	put_cpu_var(zs_map_area);
+	put_cpu_light();
 	unpin_tag(handle);
 }
 EXPORT_SYMBOL_GPL(zs_unmap_object);

Re: [patch] mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object()

[Sebastian Andrzej Siewior]

* Mike Galbraith | 2016-03-22 11:16:09 [+0100]:

>Otherwise, we get a ___might_sleep() splat.

Applied. A backtrace would be nice …

>Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>

Sebastian
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Re: [patch] mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object()

[Mike Galbraith]

On Tue, 2016-03-29 at 18:37 +0200, Sebastian Andrzej Siewior wrote:
> * Mike Galbraith | 2016-03-22 11:16:09 [+0100]:
> 
> > Otherwise, we get a ___might_sleep() splat.
> 
> Applied. A backtrace would be nice …

Ugh, I elided it because I thought it didn't add any meat.  The
cleaning lady (/me) binned it, but can re-create if really needed.

	-Mike
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