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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>
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@ -75,6 +75,7 @@
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#include <linux/cpumask.h>
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#include <linux/cpu.h>
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#include <linux/vmalloc.h>
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#include <linux/hardirq.h>
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#include "zsmalloc.h"
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#include "zsmalloc_int.h"
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@ -761,6 +762,13 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle,
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BUG_ON(!handle);
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/*
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* Because we use per-cpu mapping areas shared among the
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* pools/users, we can't allow mapping in interrupt context
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* because it can corrupt another users mappings.
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*/
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BUG_ON(in_interrupt());
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obj_handle_to_location(handle, &page, &obj_idx);
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get_zspage_mapping(get_first_page(page), &class_idx, &fg);
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class = &pool->size_class[class_idx];
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