diff options
| author | Ma Wupeng <mawupeng1@huawei.com> | 2023-08-02 15:23:28 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-21 13:37:43 -0700 |
| commit | 0db31d63f27e5b8ca84b9fd5a3cff5b12ac88abf (patch) | |
| tree | 55ba23028df34aaf9829cbbdb0f3cbe7a92d47d4 /mm/mm_init.c | |
| parent | 18c59d58baa60a8bfaec58d29b6b94877664eed8 (diff) | |
mm: disable kernelcore=mirror when no mirror memory
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.com
Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
Suggested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Suggested-by: Mike Rapoport <rppt@kernel.org>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Levi Yun <ppbuk5246@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mm_init.c')
| -rw-r--r-- | mm/mm_init.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/mm_init.c b/mm/mm_init.c index a2fbaa8d917f..2a19f3151661 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -376,6 +376,11 @@ static void __init find_zone_movable_pfns_for_nodes(void) if (mirrored_kernelcore) { bool mem_below_4gb_not_mirrored = false; + if (!memblock_has_mirror()) { + pr_warn("The system has no mirror memory, ignore kernelcore=mirror.\n"); + goto out; + } + for_each_mem_region(r) { if (memblock_is_mirror(r)) continue; |