mm: Disable memory reliable when kdump is in progress

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S
CVE: NA

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

Kdump only have limited memory and will lead to bugly memory reliable
features if memory reliable if enabled. So disable memory reliable if kdump
is in progress.
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>

mm/mem_reliable.c

@@ -7,6 +7,7 @@
 #include <linux/memory_hotplug.h>
 #include <linux/seq_file.h>
 #include <linux/mmzone.h>
+#include <linux/crash_dump.h>
 
 #define PAGES_TO_B(n_pages)	((n_pages) << PAGE_SHIFT)
 
@@ -63,6 +64,11 @@ void mem_reliable_init(bool has_unmirrored_mem, unsigned long *zone_movable_pfn,
 	if (!reliable_enabled)
 		return;
 
+	if (is_kdump_kernel()) {
+		pr_info("ignoring memory reliable due to in crashkernel\n");
+		return;
+	}
+
 	if (!mirrored_sz) {
 		memset(zone_movable_pfn, 0,
 		       sizeof(unsigned long) * MAX_NUMNODES);