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staging: zsmalloc: prevent mappping in interrupt context 

Because we use per-cpu mapping areas shared among the
pools/users, we can't allow mapping in interrupt context
because it can corrupt another users mappings.

Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Seth Jennings 2012-07-18 11:55:55 -05:00 committed by Greg Kroah-Hartman
parent 6539a36c0c
commit c60369f011
1 changed files with 8 additions and 0 deletions
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8
drivers/staging/zsmalloc/zsmalloc-main.c
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@ -75,6 +75,7 @@
#include <linux/cpumask.h>
#include <linux/cpu.h>
#include <linux/vmalloc.h>
#include <linux/hardirq.h>
#include "zsmalloc.h"
#include "zsmalloc_int.h"
@ -761,6 +762,13 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle,
BUG_ON(!handle);
/*
* Because we use per-cpu mapping areas shared among the
* pools/users, we can't allow mapping in interrupt context
* because it can corrupt another users mappings.
*/
BUG_ON(in_interrupt());
obj_handle_to_location(handle, &page, &obj_idx);
get_zspage_mapping(get_first_page(page), &class_idx, &fg);
class = &pool->size_class[class_idx];