As of v3.11-9444-g3ea67d0 "memcg: add per cgroup writeback pages accounting"
memcg use of __this_cpu_add(counter, -nr_pages) leads to incorrect statistic
values because the negated nr_pages is not sign extended (counter is long,
nr_pages is unsigned int). The memcg fix is __this_cpu_sub(counter,
As of v3.11-9444-g3ea67d0 memcg: add per cgroup writeback pages accounting
memcg use of __this_cpu_add(counter, -nr_pages) leads to incorrect statistic
values because the negated nr_pages is not sign extended (counter is long,
nr_pages is unsigned int). The memcg fix is __this_cpu_sub(counter,
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