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-rw-r--r--Documentation/printk-formats.txt10
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diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index d8d168fa79d6..7561d7ed8e11 100644
--- a/Documentation/printk-formats.txt
+++ b/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