dynamic_debug: add modname arg to exec_query callchain

Pass module name into ddebug_exec_queries(), ddebug_exec_query(), and
ddebug_parse_query() as separate parameter.  In ddebug_parse_query(),
the module name is added into the query struct before the query-string
is parsed.  This allows the query-string to be shorter:

instead of:
   $modname.dyndbg="module $modname +fp"
do this:
   $modname.dyndbg="+fp"

Omitting "module $modname" from the query string is actually required
for $modname.dyndbg rules; the set-only-once check added in a previous
patch will throw an error if its added again.  ddebug_query="..." has
no $modname associated with it, so the query string may include it.

This also fixes redundant "module $modname" otherwise needed to handle
multiple queries per string:

   $modname.dyndbg="func foo +fp; func bar +fp"

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>

1 files changed, 13 insertions, 8 deletions

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 76da6aa66ce7..cfd84638b1a4 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -338,7 +338,7 @@ static int check_set(const char **dest, char *src, char *name)
  * Returns 0 on success, <0 on error.
  */
 static int ddebug_parse_query(char *words[], int nwords,
-                               struct ddebug_query *query)
+                        struct ddebug_query *query, const char *modname)
 {
         unsigned int i;
         int rc;
@@ -348,6 +348,10 @@ static int ddebug_parse_query(char *words[], int nwords,
                 return -EINVAL;
         memset(query, 0, sizeof(*query));
 
+        if (modname)
+                /* support $modname.dyndbg=<multiple queries> */
+                query->module = modname;
+
         for (i = 0 ; i < nwords ; i += 2) {
                 if (!strcmp(words[i], "func"))
                         rc = check_set(&query->function, words[i+1], "func");
@@ -444,7 +448,7 @@ static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
         return 0;
 }
 
-static int ddebug_exec_query(char *query_string)
+static int ddebug_exec_query(char *query_string, const char *modname)
 {
         unsigned int flags = 0, mask = 0;
         struct ddebug_query query;
@@ -455,7 +459,7 @@ static int ddebug_exec_query(char *query_string)
         nwords = ddebug_tokenize(query_string, words, MAXWORDS);
         if (nwords <= 0)
                 return -EINVAL;
-        if (ddebug_parse_query(words, nwords-1, &query))
+        if (ddebug_parse_query(words, nwords-1, &query, modname))
                 return -EINVAL;
         if (ddebug_parse_flags(words[nwords-1], &flags, &mask))
                 return -EINVAL;
@@ -471,7 +475,7 @@ static int ddebug_exec_query(char *query_string)
    last error or number of matching callsites.  Module name is either
    in param (for boot arg) or perhaps in query string.
 */
-static int ddebug_exec_queries(char *query)
+static int ddebug_exec_queries(char *query, const char *modname)
 {
         char *split;
         int i, errs = 0, exitcode = 0, rc, nfound = 0;
@@ -487,7 +491,7 @@ static int ddebug_exec_queries(char *query)
 
                 vpr_info("query %d: \"%s\"\n", i, query);
 
-                rc = ddebug_exec_query(query);
+                rc = ddebug_exec_query(query, modname);
                 if (rc < 0) {
                         errs++;
                         exitcode = rc;
@@ -652,7 +656,7 @@ static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
         tmpbuf[len] = '\0';
         vpr_info("read %d bytes from userspace\n", (int)len);
 
-        ret = ddebug_exec_queries(tmpbuf);
+        ret = ddebug_exec_queries(tmpbuf, NULL);
         kfree(tmpbuf);
         if (ret < 0)
                 return ret;
@@ -878,7 +882,8 @@ static int ddebug_dyndbg_param_cb(char *param, char *val,
         if (strcmp(param, "dyndbg"))
                 return on_err; /* determined by caller */
 
-        ddebug_exec_queries(val ? val : "+p");
+        ddebug_exec_queries((val ? val : "+p"), modname);
+
         return 0; /* query failure shouldnt stop module load */
 }
 
@@ -1011,7 +1016,7 @@ static int __init dynamic_debug_init(void)
         if (ddebug_setup_string[0] != '\0') {
                 pr_warn("ddebug_query param name is deprecated,"
                         " change it to dyndbg\n");
-                ret = ddebug_exec_queries(ddebug_setup_string);
+                ret = ddebug_exec_queries(ddebug_setup_string, NULL);
                 if (ret < 0)
                         pr_warn("Invalid ddebug boot param %s",
                                 ddebug_setup_string);