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Page attributes are set using __set_bit rather than set_bit as
it normally called under a spinlock so the extra atomicity is not
needed.
However there are two places where we might set or clear page
attributes without holding the spinlock.
So add the spinlock in those cases.
This might be the cause of occasional reports that bits a aren't
getting clear properly - theory is that BITMAP_PAGE_PENDING gets lost
when BITMAP_PAGE_NEEDWRITE is set or cleared. This is an
inconvenience, not a threat to data safety.
Signed-off-by: NeilBrown <neilb@suse.de>
7c8f424798