From 8a83619cd3c34a6f4e5785b2e97aba74b5a45370 Mon Sep 17 00:00:00 2001
From: Ma Wupeng <mawupeng1@huawei.com>
Date: Wed, 21 Jun 2023 10:10:18 +0800
Subject: [PATCH] efi: Disable mirror feature during crashkernel

hulk inclusion
category: cleanup
bugzilla: https://gitee.com/openeuler/kernel/issues/I6WKXZ
CVE: NA

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

If system have no mirrored memory or use crashkernel.high while
kernelcore=mirror is enabled in cmdline, during crashkernel,
there will be limited mirrored memory and this usually lead to
OOM.

To solve this problem, disable mirror feature during crashkernel.

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
(cherry picked from commit 2bbd51a7ebc6c53770673e1fb395d09628078f26)
---
 drivers/firmware/efi/efi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index c406de00883a..97a0916d6502 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -31,6 +31,7 @@
 #include <linux/ucs2_string.h>
 #include <linux/memblock.h>
 #include <linux/security.h>
+#include <linux/crash_dump.h>
 
 #include <asm/early_ioremap.h>
 
@@ -446,6 +447,11 @@ void __init efi_find_mirror(void)
 	if (!mirrored_kernelcore)
 		return;
 
+	if (is_kdump_kernel()) {
+		mirrored_kernelcore = false;
+		return;
+	}
+
 	for_each_efi_memory_desc(md) {
 		unsigned long long start = md->phys_addr;
 		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
-- 
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