---

yaml
---
r: 319910
b: refs/heads/master
c: 31550a1
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3715c5309f6d175c3053672b73fd4f73be16fd07
+refs/heads/master: 31550a16a5d2af859e8a11839e8c6c6c9c92dfa7

trunk/Documentation/printk-formats.txt

@@ -53,6 +53,16 @@ Struct Resources:
 	For printing struct resources. The 'R' and 'r' specifiers result in a
 	printed resource with ('R') or without ('r') a decoded flags member.
 
+Raw buffer as a hex string:
+	%*ph	00 01 02  ...  3f
+	%*phC	00:01:02: ... :3f
+	%*phD	00-01-02- ... -3f
+	%*phN	000102 ... 3f
+
+	For printing a small buffers (up to 64 bytes long) as a hex string with
+	certain separator. For the larger buffers consider to use
+	print_hex_dump().
+
 MAC/FDDI addresses:
 
 	%pM	00:01:02:03:04:05

trunk/lib/vsprintf.c

@@ -654,6 +654,50 @@ char *resource_string(char *buf, char *end, struct resource *res,
 	return string(buf, end, sym, spec);
 }
 
+static noinline_for_stack
+char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
+		 const char *fmt)
+{
+	int i, len = 1;		/* if we pass '%ph[CDN]', field witdh remains
+				   negative value, fallback to the default */
+	char separator;
+
+	if (spec.field_width == 0)
+		/* nothing to print */
+		return buf;
+
+	if (ZERO_OR_NULL_PTR(addr))
+		/* NULL pointer */
+		return string(buf, end, NULL, spec);
+
+	switch (fmt[1]) {
+	case 'C':
+		separator = ':';
+		break;
+	case 'D':
+		separator = '-';
+		break;
+	case 'N':
+		separator = 0;
+		break;
+	default:
+		separator = ' ';
+		break;
+	}
+
+	if (spec.field_width > 0)
+		len = min_t(int, spec.field_width, 64);
+
+	for (i = 0; i < len && buf < end - 1; i++) {
+		buf = hex_byte_pack(buf, addr[i]);
+
+		if (buf < end && separator && i != len - 1)
+			*buf++ = separator;
+	}
+
+	return buf;
+}
+
 static noinline_for_stack
 char *mac_address_string(char *buf, char *end, u8 *addr,
 			 struct printf_spec spec, const char *fmt)
@@ -974,6 +1018,13 @@ int kptr_restrict __read_mostly;
  *       correctness of the format string and va_list arguments.
  * - 'K' For a kernel pointer that should be hidden from unprivileged users
  * - 'NF' For a netdev_features_t
+ * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
+ *            a certain separator (' ' by default):
+ *              C colon
+ *              D dash
+ *              N no separator
+ *            The maximum supported length is 64 bytes of the input. Consider
+ *            to use print_hex_dump() for the larger input.
  *
  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
  * function pointers are really function descriptors, which contain a
@@ -1007,6 +1058,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 	case 'R':
 	case 'r':
 		return resource_string(buf, end, ptr, spec, fmt);
+	case 'h':
+		return hex_string(buf, end, ptr, spec, fmt);
 	case 'M':			/* Colon separated: 00:01:02:03:04:05 */
 	case 'm':			/* Contiguous: 000102030405 */
 					/* [mM]F (FDDI) */
@@ -1296,6 +1349,8 @@ int format_decode(const char *fmt, struct printf_spec *spec)
  * %pI6c print an IPv6 address as specified by RFC 5952
  * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
  *   case.
+ * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
+ *           bytes of the input)
  * %n is ignored
  *
  * ** Please update Documentation/printk-formats.txt when making changes **