tracing/histogram: Update document for KEYS_MAX size

commit a635beeacc6d56d2b71c39e6c0103f85b53d108e upstream.

After commit 4f36c2d85ced ("tracing: Increase tracing map KEYS_MAX size"),
'keys' supports up to three fields.

Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Cc: stable@vger.kernel.org
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20221017103806.2479139-1-zhengyejian1@huawei.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst
index f99be8062bc82861b1043bfddc31f91588838e02..a9ffc4f3ee69a93d08c79b5867c98e9c6a77f52b 100644 (file)
--- a/Documentation/trace/histogram.rst
+++ b/Documentation/trace/histogram.rst
@@ -39,7 +39,7 @@ Documentation written by Tom Zanussi
   will use the event's kernel stacktrace as the key.  The keywords
   'keys' or 'key' can be used to specify keys, and the keywords
   'values', 'vals', or 'val' can be used to specify values.  Compound
-  keys consisting of up to two fields can be specified by the 'keys'
+  keys consisting of up to three fields can be specified by the 'keys'
   keyword.  Hashing a compound key produces a unique entry in the
   table for each unique combination of component keys, and can be
   useful for providing more fine-grained summaries of event data.