[PATCH v3 1/7] Documentation: dynamic-debug: Add description of level bitmask
From: Stanimir Varbanov <hidden>
Date: 2020-06-09 10:47:58
Also in:
linux-acpi, linux-arm-msm, linux-btrfs, linux-media, lkml, netdev
Subsystem:
documentation, the rest · Maintainers:
Jonathan Corbet, Linus Torvalds
This adds description of the level bitmask feature. Cc: Jonathan Corbet <corbet@lwn.net> (maintainer:DOCUMENTATION) Signed-off-by: Stanimir Varbanov <redacted> --- 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
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2.17.1