linux-kernel - [PATCH 3/8] ima: simplify conditional statement to improve performance

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Date:	Wed, 03 Sep 2014 10:19:56 +0300
From:	Dmitry Kasatkin <d.kasatkin@...sung.com>
To:	zohar@...ux.vnet.ibm.com, linux-ima-devel@...ts.sourceforge.net,
	linux-security-module@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, dmitry.kasatkin@...il.com,
	Dmitry Kasatkin <d.kasatkin@...sung.com>
Subject: [PATCH 3/8] ima: simplify conditional statement to improve performance

Precede bit testing before string comparison makes code
faster. Also refactor statement as a single line pointer
assignment.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com>
---
 security/integrity/ima/ima_main.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index f82cf9b..f7b85bf 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -206,10 +206,8 @@ static int process_measurement(struct file *file, const char *filename,
 	}
 
 	template_desc = ima_template_desc_current();
-	if (strcmp(template_desc->name, IMA_TEMPLATE_IMA_NAME) == 0) {
-		if (action & IMA_APPRAISE_SUBMASK)
-			xattr_ptr = &xattr_value;
-	} else
+	if ((action & IMA_APPRAISE_SUBMASK) ||
+		    strcmp(template_desc->name, IMA_TEMPLATE_IMA_NAME) != 0)
 		xattr_ptr = &xattr_value;
 
 	rc = ima_collect_measurement(iint, file, xattr_ptr, &xattr_len);
-- 
1.9.1

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