params: make dashes and underscores in parameter names truly equal

The user may use "foo-bar" for a kernel parameter defined as "foo_bar".
Make sure it works the other way around too.

Apply the equality of dashes and underscores on early_params and __setup
params as well.

The example given in Documentation/kernel-parameters.txt indicates that
this is the intended behaviour.

With the patch the kernel accepts "log-buf-len=1M" as expected.
https://bugzilla.redhat.com/show_bug.cgi?id=744545

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (neatened implementations)

1 files changed, 2 insertions, 2 deletions

diff --git a/init/main.c b/init/main.c
index 03b408dff825..63f5f6f8dc3b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -163,7 +163,7 @@ static int __init obsolete_checksetup(char *line)
         p = __setup_start;
         do {
                 int n = strlen(p->str);
-                if (!strncmp(line, p->str, n)) {
+                if (parameqn(line, p->str, n)) {
                         if (p->early) {
                                 /* Already done in parse_early_param?
                                  * (Needs exact match on param part).
@@ -392,7 +392,7 @@ static int __init do_early_param(char *param, char *val)
         const struct obs_kernel_param *p;
 
         for (p = __setup_start; p < __setup_end; p++) {
-                if ((p->early && strcmp(param, p->str) == 0) ||
+                if ((p->early && parameq(param, p->str)) ||
                     (strcmp(param, "console") == 0 &&
                      strcmp(p->str, "earlycon") == 0)
                 ) {