core_param() for genuinely core kernel parameters

There are a lot of one-liner uses of __setup() in the kernel: they're
cumbersome and not queryable (definitely not settable) via /sys.  Yet
it's ugly to simplify them to module_param(), because by default that
inserts a prefix of the module name (usually filename).

So, introduce a "core_param".  The parameter gets no prefix, but
appears in /sys/module/kernel/parameters/ (if non-zero perms arg).  I
thought about using the name "core", but that's more common than
"kernel".  And if you create a module called "kernel", you will die
a horrible death.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 7 insertions, 7 deletions

diff --git a/kernel/params.c b/kernel/params.c
index f27c992a4625..b077f1b045d3 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -637,14 +637,14 @@ static void __init param_sysfs_builtin(void)
 
                 dot = strchr(kp->name, '.');
                 if (!dot) {
-                        DEBUGP("couldn't find period in first %d characters "
-                               "of %s\n", MODULE_NAME_LEN, kp->name);
-                        continue;
+                        /* This happens for core_param() */
+                        strcpy(modname, "kernel");
+                        name_len = 0;
+                } else {
+                        name_len = dot - kp->name + 1;
+                        strlcpy(modname, kp->name, name_len);
                 }
-                name_len = dot - kp->name;
-                strncpy(modname, kp->name, name_len);
-                modname[name_len] = '\0';
-                kernel_add_sysfs_param(modname, kp, name_len+1);
+                kernel_add_sysfs_param(modname, kp, name_len);
         }
 }