ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 12:43:29 +02:00
Code Issues Packages Projects Releases Wiki Activity

dyndbg: refine export, rename to dynamic_debug_exec_queries()

Browse Source 
commit 4c0d77828d ("dyndbg: export ddebug_exec_queries") had a few
problems:
 - broken non DYNAMIC_DEBUG_CORE configs, sparse warning
 - the exported function modifies query string, breaks on RO strings.
 - func name follows internal convention, shouldn't be exposed as is.

1st is fixed in header with ifdefd function prototype or stub defn.
Also remove an obsolete HAVE-symbol ifdef-comment, and add others.

Fix others by wrapping existing internal function with a new one,
named in accordance with module-prefix naming convention, before
export hits v5.9.0.  In new function, copy query string to a local
buffer, so users can pass hard-coded/RO queries, and internal function
can be used unchanged.

Fixes: 4c0d77828d ("dyndbg: export ddebug_exec_queries")
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20200831182210.850852-3-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jim Cromie
2020-08-31 12:22:09 -06:00
committed by Greg Kroah-Hartman
parent b52a95eac1
commit a2d375eda7
2 changed files with 41 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
lib/dynamic_debug.c
View File

@@ -525,7 +525,7 @@ static int ddebug_exec_query(char *query_string, const char *modname)
last error or number of matching callsites. Module name is either
in param (for boot arg) or perhaps in query string.
*/
int ddebug_exec_queries(char *query, const char *modname)
static int ddebug_exec_queries(char *query, const char *modname)
{
char *split;
int i, errs = 0, exitcode = 0, rc, nfound = 0;
@@ -557,7 +557,30 @@ int ddebug_exec_queries(char *query, const char *modname)
return exitcode;
return nfound;
}
EXPORT_SYMBOL_GPL(ddebug_exec_queries);
/**
* dynamic_debug_exec_queries - select and change dynamic-debug prints
* @query: query-string described in admin-guide/dynamic-debug-howto
* @modname: string containing module name, usually &module.mod_name
*
* This uses the >/proc/dynamic_debug/control reader, allowing module
* authors to modify their dynamic-debug callsites. The modname is
* canonically struct module.mod_name, but can also be null or a
* module-wildcard, for example: "drm*".
*/
int dynamic_debug_exec_queries(const char *query, const char *modname)
{
int rc;
char *qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
if (!query)
return -ENOMEM;
rc = ddebug_exec_queries(qry, modname);
kfree(qry);
return rc;
}
EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries);
#define PREFIX_SIZE 64