module: fix the module name length in param_sysfs_builtin

the original code use KOBJ_NAME_LEN for built-in module name length,
that's defined to 20 in linux/kobject.h, but this is not enough appearntly,
many module names are longer than this;
 #define KOBJ_NAME_LEN                   20

another macro is MODULE_NAME_LEN defined in linux/module.h, I think this is
enough for module names:
 #define MODULE_NAME_LEN (64 - sizeof(unsigned long))

Signed-off-by: Denis Cheng <crquan@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 3 insertions, 5 deletions

diff --git a/kernel/params.c b/kernel/params.c
index 67f65ee7211d..42fe5e6126c0 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -376,8 +376,6 @@ int param_get_string(char *buffer, struct kernel_param *kp)
 
 extern struct kernel_param __start___param[], __stop___param[];
 
-#define MAX_KBUILD_MODNAME KOBJ_NAME_LEN
-
 struct param_attribute
 {
         struct module_attribute mattr;
@@ -587,7 +585,7 @@ static void __init param_sysfs_builtin(void)
 {
         struct kernel_param *kp, *kp_begin = NULL;
         unsigned int i, name_len, count = 0;
-        char modname[MAX_KBUILD_MODNAME + 1] = "";
+        char modname[MODULE_NAME_LEN + 1] = "";
 
         for (i=0; i < __stop___param - __start___param; i++) {
                 char *dot;
@@ -595,12 +593,12 @@ static void __init param_sysfs_builtin(void)
 
                 kp = &__start___param[i];
                 max_name_len =
-                        min_t(size_t, MAX_KBUILD_MODNAME, strlen(kp->name));
+                        min_t(size_t, MODULE_NAME_LEN, strlen(kp->name));
 
                 dot = memchr(kp->name, '.', max_name_len);
                 if (!dot) {
                         DEBUGP("couldn't find period in first %d characters "
-                               "of %s\n", MAX_KBUILD_MODNAME, kp->name);
+                               "of %s\n", MODULE_NAME_LEN, kp->name);
                         continue;
                 }
                 name_len = dot - kp->name;