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/efi-disable-mirror-feature-during-crashkernel.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Ma Wupeng <mawupeng1@xxxxxxxxxx>
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@xxxxxxxxxx
Signed-off-by: Ma Wupeng <mawupeng1@xxxxxxxxxx>
Acked-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx are
efi-disable-mirror-feature-during-crashkernel.patch
