linux-kernel - [PATCH 23/25] dynamic_debug: allow wildcard modname in boot-line query

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Date:	Wed, 30 Nov 2011 12:56:52 -0700
From:	jim.cromie@...il.com
To:	jbaron@...hat.com
Cc:	greg@...ah.com, joe@...ches.com, bart.vanassche@...il.com,
	linux-kernel@...r.kernel.org, Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH 23/25] dynamic_debug: allow wildcard modname in boot-line query

From: Jim Cromie <jim.cromie@...il.com>

Allow use of "*.dyndbg=+p" in boot-line, to turn on all debugging.
This works almost exactly like ddebug_query="+p"; it enables all
callsites for builtin modules, but does so after ddebug_query=... is
processed, and in the order of given mod.dyndbg args.

IOW, these are equivalent:

  ddebug_query="+p"		foo.dyndbg=+p
  ddebug_query="" *.dyndbg=+p	foo.dyndbg=+p

So this turns on module, function, line flags on all callsites,
which can then be enabled separately:

  *.dyndbg="+mfl"

Note that order matters if flags are set rather than added (= not +),
these are slightly different:

  " foo.dyndbg=p *.dyndbg=+mf "
  " *.dyndbg=+mf foo.dyndbg=p "

This obsoletes the remaining usage of ddebug_query; module specific
uses of ddebug_query were already covered by modname.dyndbg="...".  It
may however offend the tastes of some, or perhaps "*" should be
spelled as "dynamic_debug".  Removing ddebug_query probably also needs
a deprecation cycle, so I've deferred.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 lib/dynamic_debug.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index fc3f68a..a077cd4 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -946,7 +946,8 @@ static __init void ddebug_boot_parse_args(void)
 		if (verbose)
 			pr_info("Param: %s, val: %s\n", param, val);

-		ddebug_exec_queries((val ? val : "+p"), module);
+		ddebug_exec_queries((val ? val : "+p"),
+				    !strcmp(module, "*") ? NULL : module);
 	}
 }

-- 
1.7.7.3

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