diff --git a/validation/varargs-format-addrspace1.c b/validation/varargs-format-addrspace1.c
new file mode 100644
index 00000000..3370ac67
--- /dev/null
+++ b/validation/varargs-format-addrspace1.c
@@ -0,0 +1,36 @@
+
+extern int variadic(char *msg, ...) __attribute__((format (printf, 1, 2)));
+extern int variadic2(char *msg, int , ...) __attribute__((format (printf, 1, 3)));
+extern int variadic3(int, char *msg,  ...) __attribute__((format (printf, 2, 3)));
+
+static void test(void) {
+	void __attribute__((noderef, address_space(1))) *a;
+	void *b;
+
+	variadic("%s\n", a);
+	variadic("%s\n", b);
+	variadic("%s %s\n", b, a);
+	variadic2("%s %s\n", 1, b, a);
+	variadic3(1, "%s %s\n", b, a);
+	variadic3(1, "%s %p\n", b, a);
+}
+
+/*
+ * check-name: variadic formatting test with address-space to %s
+ * check-command: sparse -Wformat $file
+ *
+ * check-error-start
+varargs-format-addrspace1.c:10:26: warning: incorrect type in argument 2 (different address spaces)
+varargs-format-addrspace1.c:10:26:    expected char const *
+varargs-format-addrspace1.c:10:26:    got void [noderef] <asn:1> *a
+varargs-format-addrspace1.c:12:32: warning: incorrect type in argument 3 (different address spaces)
+varargs-format-addrspace1.c:12:32:    expected char const *
+varargs-format-addrspace1.c:12:32:    got void [noderef] <asn:1> *a
+varargs-format-addrspace1.c:13:36: warning: incorrect type in argument 4 (different address spaces)
+varargs-format-addrspace1.c:13:36:    expected char const *
+varargs-format-addrspace1.c:13:36:    got void [noderef] <asn:1> *a
+varargs-format-addrspace1.c:14:36: warning: incorrect type in argument 4 (different address spaces)
+varargs-format-addrspace1.c:14:36:    expected char const *
+varargs-format-addrspace1.c:14:36:    got void [noderef] <asn:1> *a
+ * check-error-end
+ */
diff --git a/validation/varargs-format-bad.c b/validation/varargs-format-bad.c
new file mode 100644
index 00000000..82ae357c
--- /dev/null
+++ b/validation/varargs-format-bad.c
@@ -0,0 +1,18 @@
+
+extern int variadic(char *msg, ...) __attribute__((format (printf, 0, 0)));
+extern int variadic2(char *msg, int , ...) __attribute__((format (printf, 2, 2)));
+extern int variadic3(char *msg, int , ...) __attribute__((format (printf, 2, 1)));
+
+static void test(void) {
+}
+
+/*
+ * check-name: variadic formatting test with bad formatting parameters
+ * check-command: sparse -Wformat $file
+ *
+ * check-error-start
+varargs-format-bad.c:2:73: warning: bad format positions
+varargs-format-bad.c:3:80: warning: bad format positions
+varargs-format-bad.c:4:80: warning: format cannot be after va_args
+* check-error-end
+ */
diff --git a/validation/varargs-format-checking.c b/validation/varargs-format-checking.c
new file mode 100644
index 00000000..9f3e5ac2
--- /dev/null
+++ b/validation/varargs-format-checking.c
@@ -0,0 +1,21 @@
+
+extern void pf(char *msg, ...) __attribute__((format (printf, 1, 2)));
+
+static void test(void) {
+	pf("%u %lu %llu\n", 1U, 1UL, 1ULL);
+	pf("%d %ld %lld\n", 1, 1L, 1LL);
+	pf("%x %lx %llx\n", 1U, 1UL, 1ULL);
+	pf("%d %ld %lld\n", 1, 1L, 1L);
+}
+
+/*
+ * check-name: variadic formatting test type checking
+ * check-command: sparse -Wformat $file
+ * check-known-to-fail
+ *
+ * check-error-start
+varargs-format-checking.c:8:36: warning: incorrect type in argument 4 (different types)
+varargs-format-checking.c:8:36:    expected long long
+varargs-format-checking.c:8:36:    got long
+ * check-error-end
+ */
diff --git a/validation/varargs-format-position.c b/validation/varargs-format-position.c
new file mode 100644
index 00000000..88a4dbc2
--- /dev/null
+++ b/validation/varargs-format-position.c
@@ -0,0 +1,32 @@
+
+extern void pf(char *msg, ...) __attribute__((format (printf, 1, 2)));
+
+static void test(void) {
+	pf("%2$d %u\n", 1U, 1L);
+	pf("%3$d %2$u\n", 1U, 1);
+	pf("%1$d %2$d\n", 1L, 1);
+}
+
+/*
+ * check-name: variadic formatting test position checking
+ * check-command: sparse -Wformat $file
+ * check-known-to-fail
+ *
+ * check-error-start
+varargs-format-position.c:5:29: warning: incorrect type in argument 3 (different types)
+varargs-format-position.c:5:29:    expected int
+varargs-format-position.c:5:29:    got long
+varargs-format-position.c:5:12: warning: format 3: position: no position specified
+varargs-format-position.c:5:29: warning: incorrect type in argument 3 (different types)
+varargs-format-position.c:5:29:    expected unsigned int
+varargs-format-position.c:5:29:    got long
+varargs-format-position.c:6:12: warning: no argument at position '4'
+varargs-format-position.c:6:31: warning: incorrect type in argument 3 (different types)
+varargs-format-position.c:6:31:    expected unsigned int
+varargs-format-position.c:6:31:    got int
+varargs-format-position.c:7:27: warning: incorrect type in argument 2 (different types)
+varargs-format-position.c:7:27:    expected int
+varargs-format-position.c:7:27:    got long
+ * check-error-end
+ *
+ */
diff --git a/validation/varargs-format-prefix.c b/validation/varargs-format-prefix.c
new file mode 100644
index 00000000..8e2456e6
--- /dev/null
+++ b/validation/varargs-format-prefix.c
@@ -0,0 +1,19 @@
+
+extern int __attribute__((format (printf, 1, 2))) variadic(char *msg, ...);
+
+static int test(void) {
+	void __attribute__((noderef, address_space(1))) *a;
+
+	variadic("%s\n", a);
+}
+
+/*
+ * check-name: variadic formatting test prefix based __attribute__
+ * check-command: sparse -Wformat $file
+ *
+ * check-error-start
+varargs-format-prefix.c:7:26: warning: incorrect type in argument 2 (different address spaces)
+varargs-format-prefix.c:7:26:    expected char const *
+varargs-format-prefix.c:7:26:    got void [noderef] <asn:1> *a
+ * check-error-end
+ */
diff --git a/validation/varargs-format-tests.c b/validation/varargs-format-tests.c
new file mode 100644
index 00000000..659bbe94
--- /dev/null
+++ b/validation/varargs-format-tests.c
@@ -0,0 +1,55 @@
+
+extern void pf(char *msg, ...) __attribute__((format (printf, 1, 2)));
+
+static int test(void)
+{
+	pf("%*d\n", 5, 10);		/* value 10, print width is 5 */
+	pf("%2$*1$d\n", 5, 10);		/* value 10, print width is 5 */
+	pf("%3$*2$d\n", 1, 5, 10);	/* ok, skipping the '1' */
+	pf("%3$-*2$d\n", 1, 5, 10);	/* ok, skipping the '1' */
+	pf("%3$*2$-d\n", 1, 5, 10);	/* bad, the "-" shouldn't be before the 'd' */
+	pf("%3$ *2$d\n", 1, 5, 10);	/* ok, skipping the '1' */
+	pf("%3$+*2$d\n", 1, 5, 10);	/* ok, skipping the '1' */
+	pf("%3$0+*2$d\n", 1, 5, 10);	/* ok, skipping the '1' */
+	pf("%3$+0*2$d\n", 1, 5, 10);	/* ok, skipping the '1' */
+	pf("%3$+#*2$d\n", 1, 5, 10);	/* ok, skipping the '1' */
+	pf("%3$+#*2$.5d\n", 1, 5, 10);	/* ok, skipping the '1' */
+
+	/* go with some precision as well as width strings */
+	pf("%2$+*1$.6d\n", 5, 10);	/* ok */
+	pf("%2$+*1$.*3$d\n", 5, 10, 6);	/* ok */
+	pf("%2$+*3$.*1$d\n", 6, 10, 5);	/* ok */
+	pf("%2$+*1$.*d\n", 5, 10, 6);	/* not ok */
+
+	pf("%s", "msg");
+	return 0;
+}
+
+static void test2(int x, int y, const void *p)
+{
+	pf("%02x%02x %8p\n", x, y, p);
+}
+
+static inline void fn(int x) { pf("%08x\n", x); }
+static void test3(int x)
+{
+	fn;
+	fn(x);
+}
+
+static void test4(int i, unsigned int u)
+{
+	pf("%d\n", i);
+	pf("%x\n", u);
+}
+
+/*
+ * check-name: variadic formatting tests for width/precisions
+ * check-command: sparse -Wformat $file
+ *
+ * check-error-start
+varargs-format-tests.c:10:12: warning: cannot evaluate type '%3$*2$-d'
+varargs-format-tests.c:10:12: warning: cannot evaluate format string
+varargs-format-tests.c:22:12: warning: format 3: position: no position specified
+ * check-error-end
+ */
diff --git a/validation/varargs-type-formattest.c b/validation/varargs-type-formattest.c
new file mode 100644
index 00000000..f01c6d89
--- /dev/null
+++ b/validation/varargs-type-formattest.c
@@ -0,0 +1,117 @@
+
+extern void pf1(char *msg, ...) __attribute__((format (printf, 1, 2)));
+extern void pf2(int m, char *msg, ...) __attribute__((format (printf, 2, 3)));
+
+/* run all the tests with both of these printf formatted types */
+#define pf(x...) do { pf1(x); pf2(1, x); } while(0);
+
+static void test(void) {
+	/* first two are valid */
+	pf("%*d", 5, 10);	/* value 10, print width is 5 */
+	pf("%2$*1$d", 5, 10);	/* value 10, print width is 5 */
+	pf("%2$*3$d", 5, 10);	/* value 10, print width is ?? */
+
+	pf("%*d", 5, 10);	/* value 10, print width is 5 */
+	pf("%*d", 5, 10L);	/* value 10, print width is 5 (bad type) */
+	pf("%*d", 5UL, 10L);	/* value 10, print width is 5 (bad type) */
+
+	pf("%3$*2$d", 1, 5, 10);	/* ok, skipping the '1' */
+	pf("%3$*2$d", 1, 5, 10L);	/* bad print type */
+	pf("%2$*3$d", 1UL, 10, 5);	/* ok, try with swapping width/val */
+	pf("%2$*3$d", 1UL, 10L, 5);	/* bad, try with swapping width/val */
+
+	/* and now try with precision specifiers */
+
+	pf("%*.6d", 5, 10);	/* value 10, print width is 5 */
+	pf("%*.6d", 5, 10L);	/* value 10, print width is 5 (bad type) */
+	pf("%*.6d", 5UL, 10L);	/* value 10, print width is 5 (bad type) */
+
+	pf("%*.*d", 5, 6, 10);	/* value 10, print width is 5 */
+	pf("%*.*d", 5, 6, 10L);	/* value 10, print width is 5 (bad type) */
+	pf("%*.*d", 5UL, 6, 10L); /* value 10, print width is 5 (bad type) */
+	pf("%*.*d", 5, 6UL, 10); /* value 10, print width is 5 (bad type) */
+}
+
+/*
+ * check-name: variadic formatting test position checking types
+ * check-command: sparse -Wformat $file
+ * check-known-to-fail
+ *
+ * check-error-start
+varargs-type-formattest.c:12:9: warning: width: no argument at position 4
+varargs-type-formattest.c:12:9: warning: width: no argument at position 5
+varargs-type-formattest.c:15:9: warning: incorrect type in argument 3 (different types)
+varargs-type-formattest.c:15:9:    expected int
+varargs-type-formattest.c:15:9:    got long
+varargs-type-formattest.c:15:9: warning: incorrect type in argument 4 (different types)
+varargs-type-formattest.c:15:9:    expected int
+varargs-type-formattest.c:15:9:    got long
+varargs-type-formattest.c:16:9: warning: incorrect type for width argument 2
+varargs-type-formattest.c:16:9:    expected int
+varargs-type-formattest.c:16:9:    got unsigned long
+varargs-type-formattest.c:16:9: warning: incorrect type in argument 3 (different types)
+varargs-type-formattest.c:16:9:    expected int
+varargs-type-formattest.c:16:9:    got long
+varargs-type-formattest.c:16:9: warning: incorrect type for width argument 3
+varargs-type-formattest.c:16:9:    expected int
+varargs-type-formattest.c:16:9:    got unsigned long
+varargs-type-formattest.c:16:9: warning: incorrect type in argument 4 (different types)
+varargs-type-formattest.c:16:9:    expected int
+varargs-type-formattest.c:16:9:    got long
+varargs-type-formattest.c:19:9: warning: incorrect type in argument 4 (different types)
+varargs-type-formattest.c:19:9:    expected int
+varargs-type-formattest.c:19:9:    got long
+varargs-type-formattest.c:19:9: warning: incorrect type in argument 5 (different types)
+varargs-type-formattest.c:19:9:    expected int
+varargs-type-formattest.c:19:9:    got long
+varargs-type-formattest.c:21:9: warning: incorrect type in argument 3 (different types)
+varargs-type-formattest.c:21:9:    expected int
+varargs-type-formattest.c:21:9:    got long
+varargs-type-formattest.c:21:9: warning: incorrect type in argument 4 (different types)
+varargs-type-formattest.c:21:9:    expected int
+varargs-type-formattest.c:21:9:    got long
+varargs-type-formattest.c:26:9: warning: incorrect type in argument 3 (different types)
+varargs-type-formattest.c:26:9:    expected int
+varargs-type-formattest.c:26:9:    got long
+varargs-type-formattest.c:26:9: warning: incorrect type in argument 4 (different types)
+varargs-type-formattest.c:26:9:    expected int
+varargs-type-formattest.c:26:9:    got long
+varargs-type-formattest.c:27:9: warning: incorrect type for width argument 2
+varargs-type-formattest.c:27:9:    expected int
+varargs-type-formattest.c:27:9:    got unsigned long
+varargs-type-formattest.c:27:9: warning: incorrect type in argument 3 (different types)
+varargs-type-formattest.c:27:9:    expected int
+varargs-type-formattest.c:27:9:    got long
+varargs-type-formattest.c:27:9: warning: incorrect type for width argument 3
+varargs-type-formattest.c:27:9:    expected int
+varargs-type-formattest.c:27:9:    got unsigned long
+varargs-type-formattest.c:27:9: warning: incorrect type in argument 4 (different types)
+varargs-type-formattest.c:27:9:    expected int
+varargs-type-formattest.c:27:9:    got long
+varargs-type-formattest.c:30:9: warning: incorrect type in argument 4 (different types)
+varargs-type-formattest.c:30:9:    expected int
+varargs-type-formattest.c:30:9:    got long
+varargs-type-formattest.c:30:9: warning: incorrect type in argument 5 (different types)
+varargs-type-formattest.c:30:9:    expected int
+varargs-type-formattest.c:30:9:    got long
+varargs-type-formattest.c:31:9: warning: incorrect type for width argument 2
+varargs-type-formattest.c:31:9:    expected int
+varargs-type-formattest.c:31:9:    got unsigned long
+varargs-type-formattest.c:31:9: warning: incorrect type in argument 4 (different types)
+varargs-type-formattest.c:31:9:    expected int
+varargs-type-formattest.c:31:9:    got long
+varargs-type-formattest.c:31:9: warning: incorrect type for width argument 3
+varargs-type-formattest.c:31:9:    expected int
+varargs-type-formattest.c:31:9:    got unsigned long
+varargs-type-formattest.c:31:9: warning: incorrect type in argument 5 (different types)
+varargs-type-formattest.c:31:9:    expected int
+varargs-type-formattest.c:31:9:    got long
+varargs-type-formattest.c:32:9: warning: incorrect type for position argument 3
+varargs-type-formattest.c:32:9:    expected int
+varargs-type-formattest.c:32:9:    got unsigned long
+varargs-type-formattest.c:32:9: warning: incorrect type for position argument 4
+varargs-type-formattest.c:32:9:    expected int
+varargs-type-formattest.c:32:9:    got unsigned long
+ * check-error-end
+ *
+ */
