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Commit c60369f0 authored by Seth Jennings's avatar Seth Jennings Committed by Greg Kroah-Hartman
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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: default avatarSeth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: default avatarMinchan Kim <minchan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6539a36c

drivers/staging/zsmalloc/zsmalloc-main.c

+8 −0
Original line number Diff line number Diff line
@@ -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];