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-rw-r--r--mm/memory.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 4ade940..d7676a6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4155,7 +4155,8 @@ void copy_user_huge_page(struct page *dst, struct page *src,
long copy_huge_page_from_user(struct page *dst_page,
const void __user *usr_src,
- unsigned int pages_per_huge_page)
+ unsigned int pages_per_huge_page,
+ bool allow_pagefault)
{
void *src = (void *)usr_src;
void *page_kaddr;
@@ -4163,11 +4164,17 @@ long copy_huge_page_from_user(struct page *dst_page,
unsigned long ret_val = pages_per_huge_page * PAGE_SIZE;
for (i = 0; i < pages_per_huge_page; i++) {
- page_kaddr = kmap_atomic(dst_page + i);
+ if (allow_pagefault)
+ page_kaddr = kmap(dst_page + i);
+ else
+ page_kaddr = kmap_atomic(dst_page + i);
rc = copy_from_user(page_kaddr,
(const void __user *)(src + i * PAGE_SIZE),
PAGE_SIZE);
- kunmap_atomic(page_kaddr);
+ if (allow_pagefault)
+ kunmap(dst_page + i);
+ else
+ kunmap_atomic(page_kaddr);
ret_val -= (PAGE_SIZE - rc);
if (rc)
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