efi: disable mirror feature during crashkernel

commit 7ea6ec4c25294e8bc8788148ef854df92ee8dc5e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 50f2f34745afa9ff6b6920515092eee634d4514c..77fd04c83d046db29912b7f3afed3339a067318d 100644 (file)
--- a/mm/mm_init.c
+++ b/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_pfns_for_nodes(void)
                        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;