maillist inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7QV2C
CVE: NA

Reference: https://lkml.kernel.org/r/20230802072328.2107981-1-mawupeng1@huawei.com

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

For system with kernelcore=mirror enabled while no mirrored memory is
reported by efi.  This could lead to kernel OOM during startup since all
memory beside zone DMA are in the movable zone and this prevents the
kernel to use it.

Zone DMA/DMA32 initialization is independent of mirrored memory and their
max pfn is set in zone_sizes_init().  Since kernel can fallback to zone
DMA/DMA32 if there is no memory in zone Normal, these zones are seen as
mirrored memory no mather their memory attributes are.

To solve this problem, disable kernelcore=mirror when there is no real
mirrored memory exists.

Link: https://lkml.kernel.org/r/20230802072328.2107981-1-mawupeng1@huawei.comSigned-off-by: NMa Wupeng <mawupeng1@huawei.com>
Suggested-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Suggested-by: NMike Rapoport <rppt@kernel.org>
Reviewed-by: NMike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Cc: Levi Yun <ppbuk5246@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
(cherry picked from commit 6087cfe0)