Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757500AbcK3Jbs (ORCPT ); Wed, 30 Nov 2016 04:31:48 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:32878 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757459AbcK3Jbc (ORCPT ); Wed, 30 Nov 2016 04:31:32 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Helge Deller Subject: [PATCH 4.8 24/37] parisc: Switch to generic sched_clock implementation Date: Wed, 30 Nov 2016 10:30:01 +0100 Message-Id: <20161130092730.872712236@linuxfoundation.org> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20161130092729.623248210@linuxfoundation.org> References: <20161130092729.623248210@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4165 Lines: 140 4.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Helge Deller commit 43b1f6abd59063a088416a0df042b36450f91f75 upstream. Drop the open-coded sched_clock() function and replace it by the provided GENERIC_SCHED_CLOCK implementation. We have seen quite some hung tasks in the past, which seem to be fixed by this patch. Signed-off-by: Helge Deller Signed-off-by: Helge Deller Signed-off-by: Greg Kroah-Hartman --- arch/parisc/Kconfig | 4 ++- arch/parisc/kernel/time.c | 57 ++++++++-------------------------------------- 2 files changed, 14 insertions(+), 47 deletions(-) --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -33,7 +33,9 @@ config PARISC select HAVE_ARCH_HASH select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK - select HAVE_UNSTABLE_SCHED_CLOCK if (SMP || !64BIT) + select GENERIC_SCHED_CLOCK + select HAVE_UNSTABLE_SCHED_CLOCK if SMP + select GENERIC_CLOCKEVENTS select ARCH_NO_COHERENT_DMA_MMAP select CPU_NO_EFFICIENT_FFS --- a/arch/parisc/kernel/time.c +++ b/arch/parisc/kernel/time.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -39,18 +40,6 @@ static unsigned long clocktick __read_mostly; /* timer cycles per tick */ -#ifndef CONFIG_64BIT -/* - * The processor-internal cycle counter (Control Register 16) is used as time - * source for the sched_clock() function. This register is 64bit wide on a - * 64-bit kernel and 32bit on a 32-bit kernel. Since sched_clock() always - * requires a 64bit counter we emulate on the 32-bit kernel the higher 32bits - * with a per-cpu variable which we increase every time the counter - * wraps-around (which happens every ~4 secounds). - */ -static DEFINE_PER_CPU(unsigned long, cr16_high_32_bits); -#endif - /* * We keep time on PA-RISC Linux by using the Interval Timer which is * a pair of registers; one is read-only and one is write-only; both @@ -121,12 +110,6 @@ irqreturn_t __irq_entry timer_interrupt( */ mtctl(next_tick, 16); -#if !defined(CONFIG_64BIT) - /* check for overflow on a 32bit kernel (every ~4 seconds). */ - if (unlikely(next_tick < now)) - this_cpu_inc(cr16_high_32_bits); -#endif - /* Skip one clocktick on purpose if we missed next_tick. * The new CR16 must be "later" than current CR16 otherwise * itimer would not fire until CR16 wrapped - e.g 4 seconds @@ -208,7 +191,7 @@ EXPORT_SYMBOL(profile_pc); /* clock source code */ -static cycle_t read_cr16(struct clocksource *cs) +static cycle_t notrace read_cr16(struct clocksource *cs) { return get_cycles(); } @@ -287,26 +270,9 @@ void read_persistent_clock(struct timesp } -/* - * sched_clock() framework - */ - -static u32 cyc2ns_mul __read_mostly; -static u32 cyc2ns_shift __read_mostly; - -u64 sched_clock(void) +static u64 notrace read_cr16_sched_clock(void) { - u64 now; - - /* Get current cycle counter (Control Register 16). */ -#ifdef CONFIG_64BIT - now = mfctl(16); -#else - now = mfctl(16) + (((u64) this_cpu_read(cr16_high_32_bits)) << 32); -#endif - - /* return the value in ns (cycles_2_ns) */ - return mul_u64_u32_shr(now, cyc2ns_mul, cyc2ns_shift); + return get_cycles(); } @@ -316,17 +282,16 @@ u64 sched_clock(void) void __init time_init(void) { - unsigned long current_cr16_khz; + unsigned long cr16_hz; - current_cr16_khz = PAGE0->mem_10msec/10; /* kHz */ clocktick = (100 * PAGE0->mem_10msec) / HZ; - - /* calculate mult/shift values for cr16 */ - clocks_calc_mult_shift(&cyc2ns_mul, &cyc2ns_shift, current_cr16_khz, - NSEC_PER_MSEC, 0); - start_cpu_itimer(); /* get CPU 0 started */ + cr16_hz = 100 * PAGE0->mem_10msec; /* Hz */ + /* register at clocksource framework */ - clocksource_register_khz(&clocksource_cr16, current_cr16_khz); + clocksource_register_hz(&clocksource_cr16, cr16_hz); + + /* register as sched_clock source */ + sched_clock_register(read_cr16_sched_clock, BITS_PER_LONG, cr16_hz); }