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Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h12
1 files changed, 9 insertions, 3 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8f857163ac89..f13f20258ce9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -137,7 +137,7 @@ extern int mmap_rnd_compat_bits __read_mostly;
* define their own version of this macro in <asm/pgtable.h>
*/
#if BITS_PER_LONG == 64
-/* This function must be updated when the size of struct page grows above 80
+/* This function must be updated when the size of struct page grows above 96
* or reduces below 56. The idea that compiler optimizes out switch()
* statement, and only leaves move/store instructions. Also the compiler can
* combine write statements if they are both assignments and can be reordered,
@@ -148,12 +148,18 @@ static inline void __mm_zero_struct_page(struct page *page)
{
unsigned long *_pp = (void *)page;
- /* Check that struct page is either 56, 64, 72, or 80 bytes */
+ /* Check that struct page is either 56, 64, 72, 80, 88 or 96 bytes */
BUILD_BUG_ON(sizeof(struct page) & 7);
BUILD_BUG_ON(sizeof(struct page) < 56);
- BUILD_BUG_ON(sizeof(struct page) > 80);
+ BUILD_BUG_ON(sizeof(struct page) > 96);
switch (sizeof(struct page)) {
+ case 96:
+ _pp[11] = 0;
+ fallthrough;
+ case 88:
+ _pp[10] = 0;
+ fallthrough;
case 80:
_pp[9] = 0;
fallthrough;