diff options
| author | Chuhong Yuan <hslester96@gmail.com> | 2019-08-08 15:18:26 +0800 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2019-08-21 12:41:43 +0200 |
| commit | 40e90656c13587c0826e8afeef3cebe585db2d2c (patch) | |
| tree | 0d733b4321ccc910b63fcb1990dd30f52725a242 /arch/s390/include/asm/gmap.h | |
| parent | 3434caec5b70519ead87e7b66dbdc18e8dbaa506 (diff) | |
s390/mm: use refcount_t for refcount
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>
Diffstat (limited to 'arch/s390/include/asm/gmap.h')
| -rw-r--r-- | arch/s390/include/asm/gmap.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h index fcbd638fb9f4..37f96b6f0e61 100644 --- a/arch/s390/include/asm/gmap.h +++ b/arch/s390/include/asm/gmap.h @@ -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; |