@@ -335,8 +335,8 @@ static inline void copy_highpage(struct page *to, struct page *from)
/*
* If architecture supports machine check exception handling, define the
* #MC versions of copy_user_highpage and copy_highpage. They copy a memory
- * page with #MC in source page (@from) handled, and return the number
- * of bytes not copied if there was a #MC, otherwise 0 for success.
+ * page with #MC in source page (@from) handled, and return -EFAULT if there
+ * was a #MC, otherwise 0 for success.
*/
static inline int copy_mc_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma)
@@ -352,7 +352,7 @@ static inline int copy_mc_user_highpage(struct page *to, struct page *from,
kunmap_local(vto);
kunmap_local(vfrom);
- return ret;
+ return ret ? -EFAULT : 0;
}
static inline int copy_mc_highpage(struct page *to, struct page *from)
@@ -368,7 +368,7 @@ static inline int copy_mc_highpage(struct page *to, struct page *from)
kunmap_local(vto);
kunmap_local(vfrom);
- return ret;
+ return ret ? -EFAULT : 0;
}
#else
static inline int copy_mc_user_highpage(struct page *to, struct page *from,
@@ -798,7 +798,7 @@ static int __collapse_huge_page_copy(pte_t *pte, struct folio *folio,
continue;
}
src_page = pte_page(pteval);
- if (copy_mc_user_highpage(page, src_page, src_addr, vma) > 0) {
+ if (copy_mc_user_highpage(page, src_page, src_addr, vma)) {
result = SCAN_COPY_MC;
break;
}
@@ -2042,7 +2042,7 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
index++;
dst++;
}
- if (copy_mc_highpage(dst, folio_page(folio, 0)) > 0) {
+ if (copy_mc_highpage(dst, folio_page(folio, 0))) {
result = SCAN_COPY_MC;
goto rollback;
}
If hardware errors are encountered during page copying, returning the bytes not copied is not meaningful, and the caller cannot do any processing on the remaining data. Returning -EFAULT is more reasonable, which represents a hardware error encountered during the copying. Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> --- include/linux/highmem.h | 8 ++++---- mm/khugepaged.c | 4 ++-- 2 files changed, 6 insertions(+), 6 deletions(-)