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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2019-03-08 03:27:41 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-08 05:32:00 +0300
commit4573fe15437c909d5a06a01750125e2a06829370 (patch)
tree61bbabd0d55420773ec4e331774658f20447e2ac /lib
parentcdf6d00696865ae1c46750059fd7d248323712f9 (diff)
downloadlinux-4573fe15437c909d5a06a01750125e2a06829370.tar.xz
dynamic_debug: use pointer comparison in ddebug_remove_module
Now that we store the passed-in string directly in ddebug_add_module, we can use pointer equality instead of strcmp. This is a little more efficient, but more importantly, this also makes the code somewhat more correct: Currently, if one loads and then unloads a module whose name happens to match the KBUILD_MODNAME of some built-in functionality (which need not even be modular at all), all of their dynamic debug entries vanish along with those of the actual module. For example, loading and unloading a core.ko hides all pr_debugs from drivers/base/core.c and other built-in files called core.c (incidentally, there is an in-tree module whose name is core, but I just tested this with an out-of-tree trivial one). Link: http://lkml.kernel.org/r/20190212214150.4807-7-linux@rasmusvillemoes.dk Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Acked-by: Jason Baron <jbaron@akamai.com> Cc: David Sterba <dsterba@suse.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Petr Mladek <pmladek@suse.com> Cc: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/dynamic_debug.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 8274c4ea75e0..214828c65625 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -929,9 +929,10 @@ int ddebug_remove_module(const char *mod_name)
mutex_lock(&ddebug_lock);
list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
- if (!strcmp(dt->mod_name, mod_name)) {
+ if (dt->mod_name == mod_name) {
ddebug_table_free(dt);
ret = 0;
+ break;
}
}
mutex_unlock(&ddebug_lock);