linux-kernel - [PATCH v2 1/3] module: merge repetitive strings in module_sig

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Date:   Sat, 31 Oct 2020 23:06:45 +0300
From:   Sergey Shtylyov <s.shtylyov@...russia.ru>
To:     Jessica Yu <jeyu@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     Joe Perches <joe@...ches.com>
Subject: [PATCH v2 1/3] module: merge repetitive strings in module_sig_check()

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: Joe Perches <joe@...ches.com>
Signed-off-by: Sergey Shtylyov <s.shtylyov@...russia.ru>

---
Changes in version 2:
- put less starting text into the pr_notice() call;
- updated the patch description accordingly, added the "Suggested-by:" tag.

 kernel/module.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Index: linux/kernel/module.c
===================================================================
--- linux.orig/kernel/module.c
+++ linux/kernel/module.c
@@ -2907,16 +2907,17 @@ static int module_sig_check(struct load_
 		 * 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;
 		}