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Subject[PATCH 09/16] dynamic_debug: combine parse_args callbacks together
Date
From: Jim Cromie <jim.cromie@gmail.com>

Refactor ddebug_dyndbg_boot_param_cb and ddebug_dyndbg_module_param_cb
into a common helper function, and call it from both. The handling of
foo.dyndbg is unneeded by the latter, but harmless. The 2 callers
differ only by pr_info and the return code they pass to the helper for
when an unknown param is handled.
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
lib/dynamic_debug.c | 36 ++++++++++++++++++++----------------
1 files changed, 20 insertions(+), 16 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index a3ab3bd..baff763 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -862,39 +862,43 @@ int ddebug_add_module(struct _ddebug *tab, unsigned int n,
}
EXPORT_SYMBOL_GPL(ddebug_add_module);

-/* handle both dyndbg=".." and $module.dyndbg=".." params at boot */
-static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
- const char *unused)
+/* helper for ddebug_dyndbg_(boot|module)_param_cb */
+static int ddebug_dyndbg_param_cb(char *param, char *val,
+ const char *modname, int on_err)
{
- const char *modname = NULL;
char *sep;

sep = strchr(param, '.');
if (sep) {
+ /* needed only for ddebug_dyndbg_boot_param_cb */
*sep = '\0';
modname = param;
param = sep + 1;
}
if (strcmp(param, "dyndbg"))
- return 0; /* skip all other params w/o error */
-
- vpr_info("module: %s %s=\"%s\"\n", modname, param, val);
+ return on_err; /* determined by caller */

ddebug_exec_queries(val ? val : "+p");
return 0; /* query failure shouldnt stop module load */
}

-/* handle dyndbg args to modprobe */
-int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *doing)
+/* handle both dyndbg and $module.dyndbg params at boot */
+static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
+ const char *unused)
{
- if (strcmp(param, "dyndbg"))
- return -ENOENT;
-
- vpr_info("module: %s %s=\"%s\"\n", doing, param, val);
-
- ddebug_exec_queries((val ? val : "+p"), doing);
+ vpr_info("%s=\"%s\"\n", param, val);
+ return ddebug_dyndbg_param_cb(param, val, NULL, 0);
+}

- return 0; /* query failure shouldnt stop module load */
+/*
+ * modprobe foo finds foo.params in boot-args, strips "foo.", and
+ * passes them to load_module(). This callback gets unknown params,
+ * processes dyndbg params, rejects others.
+ */
+int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
+{
+ vpr_info("module: %s %s=\"%s\"\n", module, param, val);
+ return ddebug_dyndbg_param_cb(param, val, module, -ENOENT);
}

static void ddebug_table_free(struct ddebug_table *dt)
--
1.7.7.6


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