From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755986Ab1KOEE4 (ORCPT ); Mon, 14 Nov 2011 23:04:56 -0500 Received: from e4.ny.us.ibm.com ([32.97.182.144]:35084 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755889Ab1KOEEz (ORCPT ); Mon, 14 Nov 2011 23:04:55 -0500 From: John Stultz To: LKML Cc: John Stultz , Thomas Gleixner , Eric Dumazet , Richard Cochran Subject: [PATCH 10/16] time: Remove most of xtime_lock usage in timekeeping.c Date: Mon, 14 Nov 2011 20:04:00 -0800 Message-Id: <1321329846-14755-11-git-send-email-john.stultz@linaro.org> X-Mailer: git-send-email 1.7.3.2.146.gca209 In-Reply-To: <1321329846-14755-1-git-send-email-john.stultz@linaro.org> References: <1321329846-14755-1-git-send-email-john.stultz@linaro.org> x-cbid: 11111504-3534-0000-0000-000001E29A23 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that ntp.c's locking is reworked, we can remove most of the xtime_lock usage in timekeeping.c The remaining xtime_lock presence is really for jiffies access and the global load calculation. CC: Thomas Gleixner CC: Eric Dumazet CC: Richard Cochran Signed-off-by: John Stultz --- kernel/time/timekeeping.c | 44 +++++++++++++++----------------------------- 1 files changed, 15 insertions(+), 29 deletions(-) diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index f92e636..810b974 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -172,7 +172,6 @@ static inline s64 timekeeping_get_ns_raw(void) return clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); } -/* must hold xtime_lock */ void timekeeping_leap_insert(int leapsecond) { unsigned long flags; @@ -368,13 +367,12 @@ EXPORT_SYMBOL(do_gettimeofday); int do_settimeofday(const struct timespec *tv) { struct timespec ts_delta; - unsigned long flags1,flags2; + unsigned long flags; if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC) return -EINVAL; - write_seqlock_irqsave(&xtime_lock, flags1); - write_seqlock_irqsave(&timekeeper.lock, flags2); + write_seqlock_irqsave(&timekeeper.lock, flags); timekeeping_forward_now(); @@ -391,8 +389,7 @@ int do_settimeofday(const struct timespec *tv) update_vsyscall(&timekeeper.xtime, &timekeeper.wall_to_monotonic, timekeeper.clock, timekeeper.mult); - write_sequnlock_irqrestore(&timekeeper.lock, flags2); - write_sequnlock_irqrestore(&xtime_lock, flags1); + write_sequnlock_irqrestore(&timekeeper.lock, flags); /* signal hrtimers about time change */ clock_was_set(); @@ -411,13 +408,12 @@ EXPORT_SYMBOL(do_settimeofday); */ int timekeeping_inject_offset(struct timespec *ts) { - unsigned long flags1,flags2; + unsigned long flags; if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) return -EINVAL; - write_seqlock_irqsave(&xtime_lock, flags1); - write_seqlock_irqsave(&timekeeper.lock, flags2); + write_seqlock_irqsave(&timekeeper.lock, flags); timekeeping_forward_now(); @@ -431,8 +427,7 @@ int timekeeping_inject_offset(struct timespec *ts) update_vsyscall(&timekeeper.xtime, &timekeeper.wall_to_monotonic, timekeeper.clock, timekeeper.mult); - write_sequnlock_irqrestore(&timekeeper.lock, flags2); - write_sequnlock_irqrestore(&xtime_lock, flags1); + write_sequnlock_irqrestore(&timekeeper.lock, flags); /* signal hrtimers about time change */ clock_was_set(); @@ -594,9 +589,7 @@ void __init timekeeping_init(void) seqlock_init(&timekeeper.lock); - write_seqlock_irqsave(&xtime_lock, flags); ntp_init(); - write_sequnlock_irqrestore(&xtime_lock, flags); write_seqlock_irqsave(&timekeeper.lock, flags); clock = clocksource_default_clock(); @@ -657,7 +650,7 @@ static void __timekeeping_inject_sleeptime(struct timespec *delta) */ void timekeeping_inject_sleeptime(struct timespec *delta) { - unsigned long flags1,flags2; + unsigned long flags; struct timespec ts; /* Make sure we don't set the clock twice */ @@ -665,8 +658,7 @@ void timekeeping_inject_sleeptime(struct timespec *delta) if (!(ts.tv_sec == 0 && ts.tv_nsec == 0)) return; - write_seqlock_irqsave(&xtime_lock, flags1); - write_seqlock_irqsave(&timekeeper.lock, flags2); + write_seqlock_irqsave(&timekeeper.lock, flags); timekeeping_forward_now(); @@ -677,8 +669,7 @@ void timekeeping_inject_sleeptime(struct timespec *delta) update_vsyscall(&timekeeper.xtime, &timekeeper.wall_to_monotonic, timekeeper.clock, timekeeper.mult); - write_sequnlock_irqrestore(&timekeeper.lock, flags2); - write_sequnlock_irqrestore(&xtime_lock, flags1); + write_sequnlock_irqrestore(&timekeeper.lock, flags); /* signal hrtimers about time change */ clock_was_set(); @@ -694,15 +685,14 @@ void timekeeping_inject_sleeptime(struct timespec *delta) */ static void timekeeping_resume(void) { - unsigned long flags1,flags2; + unsigned long flags; struct timespec ts; read_persistent_clock(&ts); clocksource_resume(); - write_seqlock_irqsave(&xtime_lock, flags1); - write_seqlock_irqsave(&timekeeper.lock, flags2); + write_seqlock_irqsave(&timekeeper.lock, flags); if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) { ts = timespec_sub(ts, timekeeping_suspend_time); @@ -712,8 +702,7 @@ static void timekeeping_resume(void) timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock); timekeeper.ntp_error = 0; timekeeping_suspended = 0; - write_sequnlock_irqrestore(&timekeeper.lock, flags2); - write_sequnlock_irqrestore(&xtime_lock, flags1); + write_sequnlock_irqrestore(&timekeeper.lock, flags); touch_softlockup_watchdog(); @@ -725,14 +714,13 @@ static void timekeeping_resume(void) static int timekeeping_suspend(void) { - unsigned long flags1,flags2; + unsigned long flags; struct timespec delta, delta_delta; static struct timespec old_delta; read_persistent_clock(&timekeeping_suspend_time); - write_seqlock_irqsave(&xtime_lock, flags1); - write_seqlock_irqsave(&timekeeper.lock, flags2); + write_seqlock_irqsave(&timekeeper.lock, flags); timekeeping_forward_now(); timekeeping_suspended = 1; @@ -755,8 +743,7 @@ static int timekeeping_suspend(void) timekeeping_suspend_time = timespec_add(timekeeping_suspend_time, delta_delta); } - write_sequnlock_irqrestore(&timekeeper.lock, flags2); - write_sequnlock_irqrestore(&xtime_lock, flags1); + write_sequnlock_irqrestore(&timekeeper.lock, flags); clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); clocksource_suspend(); @@ -916,7 +903,6 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift) /** * update_wall_time - Uses the current clocksource to increment the wall time * - * Called from the timer interrupt, must hold a write on xtime_lock. */ static void update_wall_time(void) { -- 1.7.3.2.146.gca209