hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S
CVE: NA

--------------------------------

Introduce fallback mechanism for memory reliable. memory allocation will
fallback to non-mirrored region if zone's low watermark is reached and
kswapd will be awakened at this time.

This mechanism is enabled by defalut and can be disabled by adding
"reliable_debug=F" to the kernel parameters. This mechanism rely on
CONFIG_MEMORY_RELIABLE and need "kernelcore=reliable" in the kernel
parameters.
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>