The patch titled Subject: efi: disable mirror feature during crashkernel has been added to the -mm mm-hotfixes-unstable branch. Its filename is efi-disable-mirror-feature-during-crashkernel.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Ma Wupeng mawupeng1@huawei.com Subject: efi: disable mirror feature during crashkernel Date: Tue, 9 Jan 2024 12:15:36 +0800

If the system has no mirrored memory or uses crashkernel.high while kernelcore=mirror is enabled on the command line then during crashkernel, there will be limited mirrored memory and this usually leads to OOM.

To solve this problem, disable the mirror feature during crashkernel.

Link: https://lkml.kernel.org/r/20240109041536.3903042-1-mawupeng1@huawei.com Signed-off-by: Ma Wupeng mawupeng1@huawei.com Acked-by: Mike Rapoport (IBM) rppt@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

mm/mm_init.c | 6 ++++++ 1 file changed, 6 insertions(+)

--- a/mm/mm_init.c~efi-disable-mirror-feature-during-crashkernel +++ a/mm/mm_init.c @@ -26,6 +26,7 @@ #include <linux/pgtable.h> #include <linux/swap.h> #include <linux/cma.h> +#include <linux/crash_dump.h> #include "internal.h" #include "slab.h" #include "shuffle.h" @@ -381,6 +382,11 @@ static void __init find_zone_movable_pfn goto out; }

+ if (is_kdump_kernel()) { + pr_warn("The system is under kdump, ignore kernelcore=mirror.\n"); + goto out; + } + for_each_mem_region(r) { if (memblock_is_mirror(r)) continue; _

Patches currently in -mm which might be from mawupeng1@huawei.com are

efi-disable-mirror-feature-during-crashkernel.patch