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dynamic_debug: combine parse_args callbacks together

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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.  I could slightly
reduce dmesg clutter by putting the vpr_info in the common helper,
after the return on_err, but that loses __func__ context, is overly
silent on module_cb unknown param errors, and the clutter is only when
dynamic_debug.verbose=1 anyway.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jim Cromie 2012-04-27 14:30:37 -06:00 committed by Greg Kroah-Hartman
parent f0b919d967
commit 6ab676e964
1 changed files with 20 additions and 16 deletions
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36
lib/dynamic_debug.c
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@ -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("%s=\"%s\"\n", param, val);
return ddebug_dyndbg_param_cb(param, val, NULL, 0);
}
vpr_info("module: %s %s=\"%s\"\n", doing, param, val);
ddebug_exec_queries((val ? val : "+p"));
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)