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dyndbg: accept query terms like file=bar and module=foo 

Current code expects "keyword" "arg" as 2 words, space separated.
Change to also accept "keyword=arg" form as well, and drop !(nwords%2)
requirement.  Then in rest of function, use new keyword, arg variables
instead of word[i], word[i+1]

Acked-by: <jbaron@akamai.com>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20200719231058.1586423-15-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jim Cromie 2020-07-19 17:10:54 -06:00 committed by Greg Kroah-Hartman
parent aaebe329bf
commit 14775b0496
2 changed files with 34 additions and 20 deletions
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1
Documentation/admin-guide/dynamic-debug-howto.rst
View File

@ -156,6 +156,7 @@ against. Possible keywords are:::
``line-range`` cannot contain space, e.g.
"1-30" is valid range but "1 - 30" is not.
``module=foo`` combined keyword=value form is interchangably accepted
The meanings of each keyword are:

53
lib/dynamic_debug.c
View File

@ -341,7 +341,8 @@ static int check_set(const char **dest, char *src, char *name)
/*
* Parse words[] as a ddebug query specification, which is a series
* of (keyword, value) pairs chosen from these possibilities:
* of (keyword, value) pairs or combined keyword=value terms,
* chosen from these possibilities:
*
* func <function-name>
* file <full-pathname>
@ -360,22 +361,34 @@ static int ddebug_parse_query(char *words[], int nwords,
unsigned int i;
int rc = 0;
char *fline;
/* check we have an even number of words */
if (nwords % 2 != 0) {
pr_err("expecting pairs of match-spec <value>\n");
return -EINVAL;
}
char *keyword, *arg;
if (modname)
/* support $modname.dyndbg=<multiple queries> */
query->module = modname;
for (i = 0; i < nwords; i += 2) {
if (!strcmp(words[i], "func")) {
rc = check_set(&query->function, words[i+1], "func");
} else if (!strcmp(words[i], "file")) {
if (check_set(&query->filename, words[i+1], "file"))
for (i = 0; i < nwords; i++) {
/* accept keyword=arg */
vpr_info("%d w:%s\n", i, words[i]);
keyword = words[i];
arg = strchr(keyword, '=');
if (arg) {
*arg++ = '\0';
} else {
i++; /* next word is arg */
if (!(i < nwords)) {
pr_err("missing arg to keyword: %s\n", keyword);
return -EINVAL;
}
arg = words[i];
}
vpr_info("%d key:%s arg:%s\n", i, keyword, arg);
if (!strcmp(keyword, "func")) {
rc = check_set(&query->function, arg, "func");
} else if (!strcmp(keyword, "file")) {
if (check_set(&query->filename, arg, "file"))
return -EINVAL;
/* tail :$info is function or line-range */
@ -391,18 +404,18 @@ static int ddebug_parse_query(char *words[], int nwords,
if (parse_linerange(query, fline))
return -EINVAL;
}
} else if (!strcmp(words[i], "module")) {
rc = check_set(&query->module, words[i+1], "module");
} else if (!strcmp(words[i], "format")) {
string_unescape_inplace(words[i+1], UNESCAPE_SPACE |
} else if (!strcmp(keyword, "module")) {
rc = check_set(&query->module, arg, "module");
} else if (!strcmp(keyword, "format")) {
string_unescape_inplace(arg, UNESCAPE_SPACE |
UNESCAPE_OCTAL |
UNESCAPE_SPECIAL);
rc = check_set(&query->format, words[i+1], "format");
} else if (!strcmp(words[i], "line")) {
if (parse_linerange(query, words[i+1]))
rc = check_set(&query->format, arg, "format");
} else if (!strcmp(keyword, "line")) {
if (parse_linerange(query, arg))
return -EINVAL;
} else {
pr_err("unknown keyword \"%s\"\n", words[i]);
pr_err("unknown keyword \"%s\"\n", keyword);
return -EINVAL;
}
if (rc)