From: Ma Wupeng mawupeng1@huawei.com
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I6WKXZ CVE: NA
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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 --- mm/mm_init.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/mm/mm_init.c b/mm/mm_init.c index fed4370b02e1..2318ae6de638 100644 --- 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;