[merged mm-hotfixes-stable] efi-disable-mirror-feature-during-crashkernel.patch removed from -mm tree

[merged mm-hotfixes-stable] efi-disable-mirror-feature-during-crashkernel.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: efi: disable mirror feature during crashkernel
has been removed from the -mm tree.  Its filename was
     efi-disable-mirror-feature-during-crashkernel.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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