Even reading the timezone via gettimeofday is the uncommon case... never mind
only the timezome. Whatever you do please don't slow down the common case.
On February 2, 2014 3:27:13 AM PST, stef...@seibold.net wrote:
>From: Stefani Seibold <stef...@seibold.net>
>
>This patch do a little cleanup for the __vdso_gettimeofday() function.
>
>It kick out an unneeded ret local variable and makes the code faster if
>only the timezone is needed.
>
>Signed-off-by: Stefani Seibold <stef...@seibold.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..bf969a0 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 (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 *)
--
Sent from my mobile phone. Please pardon brevity and lack of formatting.
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