md/bitmap: make bitmap bitops atomic.
This allows us to remove spinlock protection which is
more heavy-weight than simple atomics.
Signed-off-by: NNeilBrown <neilb@suse.de>
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This allows us to remove spinlock protection which is
more heavy-weight than simple atomics.
Signed-off-by: NNeilBrown <neilb@suse.de>