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Re: [PATCH 5/6]kernel:module.c variable 'nowarn' set but not used



On 06/19/2010 01:08 AM, Geert Uytterhoeven wrote:
On Sat, Jun 19, 2010 at 07:04, Justin P. Mattock
<justinmattock gmail com>  wrote:
Also wrong, you removed the creation of the links in sysfs.

The assignment to nowarn was there to avoid another compiler warning,
as sysfs_create_link() is marked __must_check.

I also went back to this one and made the following changes.. let me know if
it's wrong etc..

 From 4f45beed80627d2bb32fb021bb6d22d88089557b Mon Sep 17 00:00:00 2001
From: Justin P. Mattock<justinmattock gmail com>
Date: Fri, 18 Jun 2010 22:01:07 -0700
Subject: [PATCH 5/5] module.c
  Signed-off-by: Justin P. Mattock<justinmattock gmail com>

---
  kernel/module.c |    3 +--
  1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index 8c6b428..48fc5c8 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1340,11 +1340,10 @@ static void add_usage_links(struct module *mod)
  {
  #ifdef CONFIG_MODULE_UNLOAD
        struct module_use *use;
-       int nowarn;

        mutex_lock(&module_mutex);
        list_for_each_entry(use,&mod->target_list, target_list) {
-               nowarn = sysfs_create_link(use->target->holders_dir,
+               sysfs_create_link(use->target->holders_dir,
                                           &mod->mkobj.kobj, mod->name);
        }
        mutex_unlock(&module_mutex);
--
1.7.1.rc1.21.gf3bd6

if it looks good, then I can resend it out.

Have you compile-tested this?
As sysfs_create_link() is marked __must_check, that will cause another compiler
warning, but only if CONFIG_SYSFS=y.

Perhaps you can just mark the nowarn variable __unused?


o.k. this builds cleanly without a warning, but is it the right thing todo? i.g. rather leave the warning message there and file a bug than just silence the issue. Anyways here is what I have:

From edbeb2b1ee051218f9e5b93fcb8bbdbf1119a6e4 Mon Sep 17 00:00:00 2001
From: Justin P. Mattock <justinmattock gmail com>
Date: Sat, 19 Jun 2010 12:07:32 -0700
Subject: [PATCH 5/5] module.c
 Signed-off-by: Justin P. Mattock <justinmattock gmail com>

---
 kernel/module.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index 8c6b428..765bac5 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1340,7 +1340,7 @@ static void add_usage_links(struct module *mod)
 {
 #ifdef CONFIG_MODULE_UNLOAD
 	struct module_use *use;
-	int nowarn;
+	int nowarn __attribute__((unused));

 	mutex_lock(&module_mutex);
 	list_for_each_entry(use, &mod->target_list, target_list) {
--
1.7.1.rc1.21.gf3bd6


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