This is a note to let you know that I've just added the patch titled tracing/histogram: Update document for KEYS_MAX size to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tracing-histogram-update-document-for-keys_max-size.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From a635beeacc6d56d2b71c39e6c0103f85b53d108e Mon Sep 17 00:00:00 2001 From: Zheng Yejian <zhengyejian1@xxxxxxxxxx> Date: Mon, 17 Oct 2022 10:38:06 +0000 Subject: tracing/histogram: Update document for KEYS_MAX size From: Zheng Yejian <zhengyejian1@xxxxxxxxxx> 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@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Acked-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> Link: https://lore.kernel.org/r/20221017103806.2479139-1-zhengyejian1@xxxxxxxxxx Signed-off-by: Jonathan Corbet <corbet@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- Documentation/trace/histogram.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- 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. Patches currently in stable-queue which might be from zhengyejian1@xxxxxxxxxx are queue-4.19/tracing-histogram-update-document-for-keys_max-size.patch