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 859fd1b76c638fff44ac70b6346243d8ced2d674..69354e1e7b25535e8cff9c2c7511ff736560ada6 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.