selftests/mm: remove PROT_EXEC req from file-collapse tests

As of v6.8 commit 7fbb5e188248 ("mm: remove VM_EXEC requirement for THP
eligibility") thp collapse no longer requires file-backed mappings be
created with PROT_EXEC.

Remove the overly-strict dependency from thp collapse tests so we test the
least-strict requirement for success.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Zach O'Keefe <[e-mail]>
Reviewed-by: Baolin Wang <[e-mail]>
Acked-by: David Hildenbrand <[e-mail]>
Reviewed-by: Dev Jain <[e-mail]>
Cc: Liam Howlett <[e-mail]>
Cc: Lorenzo Stoakes <[e-mail]>
Cc: Ryan Roberts <[e-mail]>
Cc: Shuah Khan <[e-mail]>
Cc: Zi Yan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

tools/testing/selftests/mm/khugepaged.c

···
 		perror("open()");
 		exit(EXIT_FAILURE);
 	}
-	p = mmap(BASE_ADDR, size, PROT_READ | PROT_EXEC,
+	p = mmap(BASE_ADDR, size, PROT_READ,
 		 MAP_PRIVATE, finfo.fd, 0);
 	if (p == MAP_FAILED || p != BASE_ADDR) {
 		perror("mmap()");