linux-kernel - [RFC tracing 4/4] tracing: document > 8 byte numeric filtering support

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Date:   Sun,  7 Aug 2022 23:21:23 +0100
From:   Alan Maguire <alan.maguire@...cle.com>
To:     rostedt@...dmis.org
Cc:     corbet@....net, mingo@...hat.com, shuah@...nel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Alan Maguire <alan.maguire@...cle.com>
Subject: [RFC tracing 4/4] tracing: document > 8 byte numeric filtering support

For values > 8 bytes in size, only == and != filter predicates are
supported; document this.

Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
---
 Documentation/trace/events.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/trace/events.rst b/Documentation/trace/events.rst
index c47f381d0c00..318dba2fe3ee 100644
--- a/Documentation/trace/events.rst
+++ b/Documentation/trace/events.rst
@@ -186,6 +186,15 @@ The operators available for numeric fields are:
 
 ==, !=, <, <=, >, >=, &
 
+For numeric fields larger than 8 bytes, only
+
+==, !=
+
+...are allowed, and values for comparison must match field size exactly.
+For example, to match the "::1" IPv6 address:
+
+"dst == 0x00000000000000000000000000000001"
+
 And for string fields they are:
 
 ==, !=, ~
-- 
2.31.1