mm: mem_reliable: Update reliable page counter to zero if underflows
hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I77BDW CVE: NA -------------------------------- Since reliable page counter is used for debug purpose only, There is no real function problem by doing this. Signed-off-by: NMa Wupeng <mawupeng1@huawei.com> Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: NNanyong Sun <sunnanyong@huawei.com> (cherry picked from commit a687d7a0)
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