s390/extmem: 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/20190808071817.6595-1-hslester96@gmail.com
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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Chuhong Yuan 2019-08-08 15:18:17 +08:00 • committed by Vasily Gorbik

parent c4c3772384

commit 3434caec5b

1 changed files with 6 additions and 5 deletions

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arch/s390/mm/extmem.c

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