module: merge repetitive strings in module_sig_check()

stable inclusion
from stable-5.10.26
commit 8587715b65faae25b07db16d07d09b5831f44742
bugzilla: 51363

--------------------------------

[ Upstream commit 705e9195 ]

The 'reason' variable in module_sig_check() points to 3 strings across
the *switch* statement, all needlessly starting with the same text.
Let's put the starting text into the pr_notice() call -- it saves 21
bytes of the object code (x86 gcc 10.2.1).
Suggested-by: NJoe Perches <joe@perches.com>
Reviewed-by: NMiroslav Benes <mbenes@suse.cz>
Signed-off-by: NSergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: NJessica Yu <jeyu@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: N  Weilong Chen <chenweilong@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

kernel/module.c

@@ -2922,16 +2922,17 @@ static int module_sig_check(struct load_info *info, int flags)
 		 * enforcing, certain errors are non-fatal.
 		 */
 	case -ENODATA:
-		reason = "Loading of unsigned module";
+		reason = "unsigned module";
 		goto decide;
 	case -ENOPKG:
-		reason = "Loading of module with unsupported crypto";
+		reason = "module with unsupported crypto";
 		goto decide;
 	case -ENOKEY:
-		reason = "Loading of module with unavailable key";
+		reason = "module with unavailable key";
 	decide:
 		if (is_module_sig_enforced()) {
-			pr_notice("%s: %s is rejected\n", info->name, reason);
+			pr_notice("%s: loading of %s is rejected\n",
+				  info->name, reason);
 			return -EKEYREJECTED;
 		}