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Mikulas Patocka authored
There was a deliberate race condition in dm_stat_for_entry() to avoid the overhead of disabling and enabling interrupts. The race could result in some events not being counted on 64-bit architectures. However, on 32-bit architectures, operations on long long variables are not atomic, so the race condition could cause the counter to jump by 2^32. Such jumps could be disruptive, so we need to do proper locking on 32-bit architectures. Signed-off-by:
Mikulas Patocka <mpatocka@redhat.com> Cc: Alasdair G. Kergon <agk@redhat.com> Signed-off-by:
Mike Snitzer <snitzer@redhat.com>
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