linux-kernel - [PATCH v23 06/13] x86, vdso: Cleanup __vdso

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Message-Id: <1395094933-14252-7-git-send-email-stefani@seibold.net>
Date:	Mon, 17 Mar 2014 23:22:06 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, ak@...ux.intel.com, aarcange@...hat.com,
	john.stultz@...aro.org, luto@...capital.net, xemul@...allels.com,
	gorcunov@...nvz.org, andriy.shevchenko@...ux.intel.com
Cc:	Martin.Runge@...de-schwarz.com, Andreas.Brief@...de-schwarz.com,
	Stefani Seibold <stefani@...bold.net>
Subject: [PATCH v23 06/13] x86, vdso: Cleanup __vdso_gettimeofday()

This patch do a little cleanup for the __vdso_gettimeofday() function.

It kicks out an unneeded ret local variable and makes the code faster
if only the timezone is needed (an admittedly rare case.)

Reviewed-by: Andy Lutomirski <luto@...capital.net>
Signed-off-by: Stefani Seibold <stefani@...bold.net>
---
 arch/x86/vdso/vclock_gettime.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
index 743f277..09dae4a 100644
--- a/arch/x86/vdso/vclock_gettime.c
+++ b/arch/x86/vdso/vclock_gettime.c
@@ -259,13 +259,12 @@ int clock_gettime(clockid_t, struct timespec *)
 
 notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
 {
-	long ret = VCLOCK_NONE;
-
 	if (likely(tv != NULL)) {
 		BUILD_BUG_ON(offsetof(struct timeval, tv_usec) !=
 			     offsetof(struct timespec, tv_nsec) ||
 			     sizeof(*tv) != sizeof(struct timespec));
-		ret = do_realtime((struct timespec *)tv);
+		if (unlikely(do_realtime((struct timespec *)tv) == VCLOCK_NONE))
+			return vdso_fallback_gtod(tv, tz);
 		tv->tv_usec /= 1000;
 	}
 	if (unlikely(tz != NULL)) {
@@ -274,8 +273,6 @@ notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
 		tz->tz_dsttime = gtod->sys_tz.tz_dsttime;
 	}
 
-	if (ret == VCLOCK_NONE)
-		return vdso_fallback_gtod(tv, tz);
 	return 0;
 }
 int gettimeofday(struct timeval *, struct timezone *)
-- 
1.9.0

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