The patch titled
Subject: mm/mm_init: ignore kernelcore=mirror boot option when no mirror memory presents.
has been added to the -mm mm-unstable branch. Its filename is
mm-mm_init-ignore-kernelcore=mirror-boot-option-when-no-mirror-memory-presents.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mm_init-ignore-kernelcore=mirror-boot-option-when-no-mirror-memory-presents.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Levi Yun <ppbuk5246@xxxxxxxxx>
Subject: mm/mm_init: ignore kernelcore=mirror boot option when no mirror memory presents.
Date: Wed, 2 Aug 2023 19:36:14 +0100
In a machine where no mirror memory is set, All memory region in
ZONE_NORMAL is used as ZONE_MOVABLE when kernelcore=mirror boot option is
used. So, ZONE_NORMAL couldn't be populated properly because all of
ZONE_NORMAL pages is absent.
To avoid this abnormal situation,
ignore disable kernelcore=mirror option when no mirror memory is found.
Link: https://lkml.kernel.org/r/20230802183614.15520-1-ppbuk5246@xxxxxxxxx
Signed-off-by: Levi Yun <ppbuk5246@xxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mm_init.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/mm/mm_init.c~mm-mm_init-ignore-kernelcore=mirror-boot-option-when-no-mirror-memory-presents
+++ a/mm/mm_init.c
@@ -376,10 +376,13 @@ static void __init find_zone_movable_pfn
*/
if (mirrored_kernelcore) {
bool mem_below_4gb_not_mirrored = false;
+ bool no_mirror_mem = true;
for_each_mem_region(r) {
- if (memblock_is_mirror(r))
+ if (memblock_is_mirror(r)) {
+ no_mirror_mem = false;
continue;
+ }
nid = memblock_get_region_node(r);
@@ -398,6 +401,12 @@ static void __init find_zone_movable_pfn
if (mem_below_4gb_not_mirrored)
pr_warn("This configuration results in unmirrored kernel memory.\n");
+ if (no_mirror_mem) {
+ pr_warn("There is no mirrored memory. Ignore kernelcore=mirror.\n");
+ mirrored_kernelcore = false;
+ memset(zone_movable_pfn, 0x00, sizeof(zone_movable_pfn));
+ }
+
goto out2;
}
_
Patches currently in -mm which might be from ppbuk5246@xxxxxxxxx are
damon-use-pmdp_get-instead-of-drectly-dereferencing-pmd.patch
mm-mm_init-ignore-kernelcore=mirror-boot-option-when-no-mirror-memory-presents.patch
