From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751913AbbBKDn6 (ORCPT ); Tue, 10 Feb 2015 22:43:58 -0500 Received: from v094114.home.net.pl ([79.96.170.134]:52286 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750759AbbBKDnD (ORCPT ); Tue, 10 Feb 2015 22:43:03 -0500 From: "Rafael J. Wysocki" To: Thomas Gleixner Cc: Peter Zijlstra , Alan Cox , "Li, Aubrey" , LKML , Linux PM list , ACPI Devel Maling List , Kristen Carlson Accardi , John Stultz , Len Brown Subject: [PATCH 2/6] timekeeping: Pass readout base to update_fast_timekeeper() Date: Wed, 11 Feb 2015 05:01:52 +0100 Message-ID: <1973562.AfpZ97hsgV@vostro.rjw.lan> User-Agent: KMail/4.11.5 (Linux/3.16.0-rc5+; KDE/4.11.5; x86_64; ; ) In-Reply-To: <8292243.ibkmfVtXac@vostro.rjw.lan> References: <8292243.ibkmfVtXac@vostro.rjw.lan> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafael J. Wysocki Modify update_fast_timekeeper() to take a struct tk_read_base pointer as its argument (instead of a struct timekeeper pointer) and update its kerneldoc comment to reflect that. That will allow a struct tk_read_base that is not part of a struct timekeeper to be passed to it in the next patch. Signed-off-by: Rafael J. Wysocki --- kernel/time/timekeeping.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) Index: linux-pm/kernel/time/timekeeping.c =================================================================== --- linux-pm.orig/kernel/time/timekeeping.c +++ linux-pm/kernel/time/timekeeping.c @@ -230,9 +230,7 @@ static inline s64 timekeeping_get_ns_raw /** * update_fast_timekeeper - Update the fast and NMI safe monotonic timekeeper. - * @tk: The timekeeper from which we take the update - * @tkf: The fast timekeeper to update - * @tbase: The time base for the fast timekeeper (mono/raw) + * @tkr: Timekeeping readout base from which we take the update * * We want to use this from any context including NMI and tracing / * instrumenting the timekeeping code itself. @@ -244,11 +242,11 @@ static inline s64 timekeeping_get_ns_raw * smp_wmb(); <- Ensure that the last base[1] update is visible * tkf->seq++; * smp_wmb(); <- Ensure that the seqcount update is visible - * update(tkf->base[0], tk); + * update(tkf->base[0], tkr); * smp_wmb(); <- Ensure that the base[0] update is visible * tkf->seq++; * smp_wmb(); <- Ensure that the seqcount update is visible - * update(tkf->base[1], tk); + * update(tkf->base[1], tkr); * * The reader side does: * @@ -269,7 +267,7 @@ static inline s64 timekeeping_get_ns_raw * slightly wrong timestamp (a few nanoseconds). See * @ktime_get_mono_fast_ns. */ -static void update_fast_timekeeper(struct timekeeper *tk) +static void update_fast_timekeeper(struct tk_read_base *tkr) { struct tk_read_base *base = tk_fast_mono.base; @@ -277,7 +275,7 @@ static void update_fast_timekeeper(struc raw_write_seqcount_latch(&tk_fast_mono.seq); /* Update base[0] */ - memcpy(base, &tk->tkr, sizeof(*base)); + memcpy(base, tkr, sizeof(*base)); /* Force readers back to base[0] */ raw_write_seqcount_latch(&tk_fast_mono.seq); @@ -462,7 +460,7 @@ static void timekeeping_update(struct ti memcpy(&shadow_timekeeper, &tk_core.timekeeper, sizeof(tk_core.timekeeper)); - update_fast_timekeeper(tk); + update_fast_timekeeper(&tk->tkr); } /**