diff options
| author | Ma Wupeng <mawupeng1@huawei.com> | 2023-08-02 10:23:28 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-21 23:37:43 +0300 |
| commit | 0db31d63f27e5b8ca84b9fd5a3cff5b12ac88abf (patch) | |
| tree | 55ba23028df34aaf9829cbbdb0f3cbe7a92d47d4 /mm/memblock.c | |
| parent | 18c59d58baa60a8bfaec58d29b6b94877664eed8 (diff) | |
| download | linux-0db31d63f27e5b8ca84b9fd5a3cff5b12ac88abf.tar.xz | |
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/memblock.c')
| -rw-r--r-- | mm/memblock.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c index f9e61e565a53..913b2520a9a0 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -161,6 +161,11 @@ static int memblock_can_resize __initdata_memblock; static int memblock_memory_in_slab __initdata_memblock; static int memblock_reserved_in_slab __initdata_memblock; +bool __init_memblock memblock_has_mirror(void) +{ + return system_has_some_mirror; +} + static enum memblock_flags __init_memblock choose_memblock_flags(void) { return system_has_some_mirror ? MEMBLOCK_MIRROR : MEMBLOCK_NONE; |