mm/shmem.c: fix judgment error in shmem_is_huge()

In the case of SHMEM_HUGE_WITHIN_SIZE, the page index is not rounded up
correctly.  When the page index points to the first page in a huge page,
round_up() cannot bring it to the end of the huge page, but to the end
of the previous one.

An example:

HPAGE_PMD_NR on my machine is 512(2 MB huge page size).  After
allcoating a 3000 KB buffer, I access it at location 2050 KB.  In
shmem_is_huge(), the corresponding index happens to be 512.  After
rounded up by HPAGE_PMD_NR, it will still be 512 which is smaller than
i_size, and shmem_is_huge() will return true.  As a result, my buffer
takes an additional huge page, and that shouldn't happen when
shmem_enabled is set to within_size.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: f3f0e1d ("khugepaged: add support of collapse for tmpfs/shmem pages")
Signed-off-by: Liu Yuntao <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Acked-by: Hugh Dickins <[email protected]>
Cc: wuxu.wu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

mm/shmem.c

@@ -490,9 +490,9 @@ bool shmem_is_huge(struct vm_area_struct *vma,
 	case SHMEM_HUGE_ALWAYS:
 		return true;
 	case SHMEM_HUGE_WITHIN_SIZE:
-		index = round_up(index, HPAGE_PMD_NR);
+		index = round_up(index + 1, HPAGE_PMD_NR);
 		i_size = round_up(i_size_read(inode), PAGE_SIZE);
-		if (i_size >= HPAGE_PMD_SIZE && (i_size >> PAGE_SHIFT) >= index)
+		if (i_size >> PAGE_SHIFT >= index)
 			return true;
 		fallthrough;
 	case SHMEM_HUGE_ADVISE: