summaryrefslogtreecommitdiffstats
path: root/include
diff options
context:
space:
mode:
authorLiu Shixin <liushixin2@huawei.com>2023-04-13 15:13:49 +0200
committerAndrew Morton <akpm@linux-foundation.org>2023-04-19 01:30:09 +0200
commit1cb9dc4b475c7418f925ab0c97b6750007d9f52e (patch)
tree5e24dedfab2791b6bc1d41e130fa490ce61dcb50 /include
parentmemcg: page_cgroup_ino() get memcg from the page's folio (diff)
downloadlinux-1cb9dc4b475c7418f925ab0c97b6750007d9f52e.tar.xz
linux-1cb9dc4b475c7418f925ab0c97b6750007d9f52e.zip
mm: hwpoison: support recovery from HugePage copy-on-write faults
copy-on-write of hugetlb user pages with uncorrectable errors will result in a kernel crash. This is because the copy is performed in kernel mode and in general we can not handle accessing memory with such errors while in kernel mode. Commit a873dfe1032a ("mm, hwpoison: try to recover from copy-on write faults") introduced the routine copy_user_highpage_mc() to gracefully handle copying of user pages with uncorrectable errors. However, the separate hugetlb copy-on-write code paths were not modified as part of commit a873dfe1032a. Modify hugetlb copy-on-write code paths to use copy_mc_user_highpage() so that they can also gracefully handle uncorrectable errors in user pages. This involves changing the hugetlb specific routine copy_user_large_folio() from type void to int so that it can return an error. Modify the hugetlb userfaultfd code in the same way so that it can return -EHWPOISON if it encounters an uncorrectable error. Link: https://lkml.kernel.org/r/20230413131349.2524210-1-liushixin2@huawei.com Signed-off-by: Liu Shixin <liushixin2@huawei.com> Acked-by: Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by: Naoya Horiguchi <naoya.horiguchi@nec.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Muchun Song <muchun.song@linux.dev> Cc: Tony Luck <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 0b514de43143..2772a1800cf3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3693,9 +3693,9 @@ extern const struct attribute_group memory_failure_attr_group;
extern void clear_huge_page(struct page *page,
unsigned long addr_hint,
unsigned int pages_per_huge_page);
-void copy_user_large_folio(struct folio *dst, struct folio *src,
- unsigned long addr_hint,
- struct vm_area_struct *vma);
+int copy_user_large_folio(struct folio *dst, struct folio *src,
+ unsigned long addr_hint,
+ struct vm_area_struct *vma);
long copy_folio_from_user(struct folio *dst_folio,
const void __user *usr_src,
bool allow_pagefault);