netdev - [PATCH v3 1/7] Documentation: dynamic-debug: Add description of level bitmask

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Message-Id: <20200609104604.1594-2-stanimir.varbanov@linaro.org>
Date:   Tue,  9 Jun 2020 13:45:58 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-acpi@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     Joe Perches <joe@...ches.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Baron <jbaron@...mai.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Jonathan Corbet <corbet@....net>
Subject: [PATCH v3 1/7] Documentation: dynamic-debug: Add description of level bitmask

This adds description of the level bitmask feature.

Cc: Jonathan Corbet <corbet@....net> (maintainer:DOCUMENTATION)

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---
 Documentation/admin-guide/dynamic-debug-howto.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
index 0dc2eb8e44e5..c2b751fc8a17 100644
--- a/Documentation/admin-guide/dynamic-debug-howto.rst
+++ b/Documentation/admin-guide/dynamic-debug-howto.rst
@@ -208,6 +208,12 @@ line
 	line -1605          // the 1605 lines from line 1 to line 1605
 	line 1600-          // all lines from line 1600 to the end of the file
 
+level
+    The given level will be a bitmask ANDed with the level of the each ``pr_debug()``
+    callsite. This will allow to group debug messages and show only those of the
+    same level.  The -p flag takes precedence over the given level. Note that we can
+    have up to five groups of debug messages.
+
 The flags specification comprises a change operation followed
 by one or more flag characters.  The change operation is one
 of the characters::
@@ -346,6 +352,10 @@ Examples
   // add module, function to all enabled messages
   nullarbor:~ # echo -n '+mf' > <debugfs>/dynamic_debug/control
 
+  // enable all messages in file with 0x01 level bitmask
+  nullarbor:~ # echo -n 'file foo.c level 0x01 +p' >
+                                <debugfs>/dynamic_debug/control
+
   // boot-args example, with newlines and comments for readability
   Kernel command line: ...
     // see whats going on in dyndbg=value processing
-- 
2.17.1