linux-kernel - [PATCH v2] kernel/itimer.c: beautify code, not need check 'value', so save one instruction, simpler and easier for readers.

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Message-ID: <51C2E6F9.80107@asianux.com>
Date:	Thu, 20 Jun 2013 19:26:49 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] kernel/itimer.c: beautify code, not need check 'value',
 so save one instruction, simpler and easier for readers.


Since copy_to_user() will check 'value', we do not need check it outside
again,  so can save one comparing instruction at least.

Also can let code simpler and easier for readers: if checking parameter
'value', it will easily lead readers to think about why not return
-EINVAL instead of -EFAULT, when checking parameter failed.

Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 kernel/itimer.c |   13 ++++++-------
 1 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/kernel/itimer.c b/kernel/itimer.c
index 8d262b4..3b12271 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -102,15 +102,14 @@ int do_getitimer(int which, struct itimerval *value)
 
 SYSCALL_DEFINE2(getitimer, int, which, struct itimerval __user *, value)
 {
-	int error = -EFAULT;
+	int error;
 	struct itimerval get_buffer;
 
-	if (value) {
-		error = do_getitimer(which, &get_buffer);
-		if (!error &&
-		    copy_to_user(value, &get_buffer, sizeof(get_buffer)))
-			error = -EFAULT;
-	}
+	error = do_getitimer(which, &get_buffer);
+	if (!error &&
+	    copy_to_user(value, &get_buffer, sizeof(get_buffer)))
+		error = -EFAULT;
+
 	return error;
 }
 
-- 
1.7.7.6
--
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