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s390/mm: use refcount_t for refcount

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Reference counters are preferred to use refcount_t instead of
atomic_t.
This is because the implementation of refcount_t can prevent
overflows and detect possible use-after-free.
So convert atomic_t ref counters to refcount_t.

Link: http://lkml.kernel.org/r/20190808071826.6649-1-hslester96@gmail.com
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Chuhong Yuan
2019-08-08 15:18:26 +08:00
committed by Vasily Gorbik
parent 3434caec5b
commit 40e90656c1
2 changed files with 8 additions and 6 deletions
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4
arch/s390/include/asm/gmap.h
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@@ -9,6 +9,8 @@
#ifndef _ASM_S390_GMAP_H
#define _ASM_S390_GMAP_H
#include <linux/refcount.h>
/* Generic bits for GMAP notification on DAT table entry changes. */
#define GMAP_NOTIFY_SHADOW 0x2
#define GMAP_NOTIFY_MPROT 0x1
@@ -46,7 +48,7 @@ struct gmap {
struct radix_tree_root guest_to_host;
struct radix_tree_root host_to_guest;
spinlock_t guest_table_lock;
atomic_t ref_count;
refcount_t ref_count;
unsigned long *table;
unsigned long asce;
unsigned long asce_end;