From: Zhang Jian zhangjian210@huawei.com

ascend inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4OXH9 CVE: NA

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

Collect the processes who have the page mapped via collect_procs().

@page if the page is a part of the hugepages/compound-page, we must using compound_head() to find it's head page to prevent the kernel panic, and make the page be locked.

@to_kill the function will return a linked list, when we have used this list, we must kfree the list.

@force_early if we want to find all process, we must make it be true, if it's false, the function will only return the process who have PF_MCE_PROCESS or PF_MCE_EARLY mark.

limits: if force_early is true, sysctl_memory_failure_early_kill is useless. If it's false, no process have PF_MCE_PROCESS and PF_MCE_EARLY flag, and the sysctl_memory_failure_early_kill is enabled, function will return all tasks whether the task have the PF_MCE_PROCESS and PF_MCE_EARLY flag.

Signed-off-by: Zhang Jian zhangjian210@huawei.com Reviewed-by: Weilong Chen chenweilong@huawei.com Reviewed-by: Kefeng Wangwangkefeng.wang@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- include/linux/mm.h | 2 ++ mm/memory-failure.c | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h index f801fa5e60289..7b724d39e6ee0 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2866,6 +2866,8 @@ extern int sysctl_memory_failure_recovery; extern void shake_page(struct page *p, int access); extern atomic_long_t num_poisoned_pages __read_mostly; extern int soft_offline_page(struct page *page, int flags); +extern void collect_procs(struct page *page, struct list_head *tokill, + int force_early);

/* diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 52619a9bc3b0e..72e1746e5386f 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -512,7 +512,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill, * First preallocate one tokill structure outside the spin locks, * so that we can kill at least one process reasonably reliable. */ -static void collect_procs(struct page *page, struct list_head *tokill, +void collect_procs(struct page *page, struct list_head *tokill, int force_early) { struct to_kill *tk; @@ -529,6 +529,7 @@ static void collect_procs(struct page *page, struct list_head *tokill, collect_procs_file(page, tokill, &tk, force_early); kfree(tk); } +EXPORT_SYMBOL_GPL(collect_procs);

static const char *action_name[] = { [MF_IGNORED] = "Ignored",