diff --git a/arch/s390/kernel/diag/diag310.c b/arch/s390/kernel/diag/diag310.c
index f411562aa7f6..c68ec9d28513 100644
--- a/arch/s390/kernel/diag/diag310.c
+++ b/arch/s390/kernel/diag/diag310.c
@@ -190,17 +190,18 @@ static int memtop_get_stride_len(unsigned long *res)
 static int memtop_get_page_count(unsigned long *res, unsigned long level)
 {
 	static unsigned long memtop_pages[DIAG310_LEVELMAX];
-	unsigned long pages;
+	unsigned long pages, idx;
 	int rc;
 
 	if (level > DIAG310_LEVELMAX || level < DIAG310_LEVELMIN)
 		return -EINVAL;
-	pages = READ_ONCE(memtop_pages[level - 1]);
+	idx = array_index_nospec(level - 1, ARRAY_SIZE(memtop_pages));
+	pages = READ_ONCE(memtop_pages[idx]);
 	if (!pages) {
 		rc = diag310_get_memtop_size(&pages, level);
 		if (rc)
 			return rc;
-		WRITE_ONCE(memtop_pages[level - 1], pages);
+		WRITE_ONCE(memtop_pages[idx], pages);
 	}
 	*res = pages;
 	return 0;
diff --git a/arch/s390/kernel/vdso/note.S b/arch/s390/kernel/vdso/note.S
index db19d0680a0a..d215781f26b5 100644
--- a/arch/s390/kernel/vdso/note.S
+++ b/arch/s390/kernel/vdso/note.S
@@ -4,6 +4,7 @@
  * Here we can supply some information useful to userland.
  */
 
+#include <linux/build-salt.h>
 #include <linux/uts.h>
 #include <linux/version.h>
 #include <linux/elfnote.h>
@@ -11,3 +12,5 @@
 ELFNOTE_START(Linux, 0, "a")
 	.long LINUX_VERSION_CODE
 ELFNOTE_END
+
+BUILD_SALT
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 2a222a7e14f4..ef7bfc87758c 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -64,7 +64,7 @@ static inline unsigned long mmap_base(unsigned long rnd,
 	return PAGE_ALIGN(STACK_TOP - gap - rnd);
 }
 
-static int get_align_mask(struct file *filp, unsigned long flags)
+static unsigned long get_align_mask(struct file *filp, unsigned long flags)
 {
 	if (filp && is_file_hugepages(filp))
 		return huge_page_mask_align(filp);
diff --git a/drivers/s390/crypto/zcrypt_cex2a.c b/drivers/s390/crypto/zcrypt_cex2a.c
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/drivers/s390/crypto/zcrypt_cex2a.h b/drivers/s390/crypto/zcrypt_cex2a.h
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/drivers/s390/crypto/zcrypt_cex2c.c b/drivers/s390/crypto/zcrypt_cex2c.c
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/drivers/s390/crypto/zcrypt_cex2c.h b/drivers/s390/crypto/zcrypt_cex2c.h
deleted file mode 100644
index e69de29bb2d1..000000000000