mm: Drop reliable_reserve_size
hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S CVE: NA -------------------------------- Commit 368d710d ("mm: Fallback to non-mirrored region below low watermark") already set the default value of reliable_reserve_size to zero which will disable reliable watermark check by default. With this patch, code related to this mechanism is removed since no one use this watermark check. Signed-off-by: NMa Wupeng <mawupeng1@huawei.com> Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>
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