Modules updates for v5.10

Summary of modules changes for the 5.10 merge window:
 
 - Code cleanups. More informative error messages and statically
   initialize init_free_wq to avoid a workqueue warning.
 
 Signed-off-by: Jessica Yu <jeyu@kernel.org>
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Merge tag 'modules-for-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux

Pull modules updates from Jessica Yu:
 "Code cleanups: more informative error messages and statically
  initialize init_free_wq to avoid a workqueue warning"

* tag 'modules-for-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
  module: statically initialize init section freeing data
  module: Add more error message for failed kernel module loading

kernel/module.c

@@ -92,8 +92,9 @@ EXPORT_SYMBOL_GPL(module_mutex);
 static LIST_HEAD(modules);
 
 /* Work queue for freeing init sections in success case */
-static struct work_struct init_free_wq;
-static struct llist_head init_free_list;
+static void do_free_init(struct work_struct *w);
+static DECLARE_WORK(init_free_wq, do_free_init);
+static LLIST_HEAD(init_free_list);
 
 #ifdef CONFIG_MODULES_TREE_LOOKUP
 
@@ -2097,8 +2098,11 @@ static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
 	int i;
 
 	for (i = 0; i < hdr->e_shnum; i++) {
-		if ((sechdrs[i].sh_flags & shf_wx) == shf_wx)
+		if ((sechdrs[i].sh_flags & shf_wx) == shf_wx) {
+			pr_err("%s: section %s (index %d) has invalid WRITE|EXEC flags\n",
+				mod->name, secstrings + sechdrs[i].sh_name, i);
 			return -ENOEXEC;
+		}
 	}
 
 	return 0;
@@ -3591,14 +3595,6 @@ static void do_free_init(struct work_struct *w)
 	}
 }
 
-static int __init modules_wq_init(void)
-{
-	INIT_WORK(&init_free_wq, do_free_init);
-	init_llist_head(&init_free_list);
-	return 0;
-}
-module_init(modules_wq_init);
-
 /*
  * This is where the real work happens.
  *
@@ -3841,8 +3837,10 @@ static int load_module(struct load_info *info, const char __user *uargs,
 	char *after_dashes;
 
 	err = elf_header_check(info);
-	if (err)
+	if (err) {
+		pr_err("Module has invalid ELF header\n");
 		goto free_copy;
+	}
 
 	err = setup_load_info(info, flags);
 	if (err)
@@ -3850,6 +3848,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
 
 	if (blacklisted(info->name)) {
 		err = -EPERM;
+		pr_err("Module %s is blacklisted\n", info->name);
 		goto free_copy;
 	}