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    SubjectRe: [PATCH 1/1] Clocksource: Move the Hyper-V clocksource driver out of staging
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    On Mon, 2011-05-23 at 10:12 -0700, K. Y. Srinivasan wrote:
    > Move the Hyper-V clocksource driver out of staging.
    >
    > Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
    > Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
    > Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
    > ---
    > drivers/clocksource/Makefile | 1 +
    > drivers/clocksource/hv_timesource.c | 102 +++++++++++++++++++++++++++++++++++
    > drivers/staging/hv/Makefile | 2 +-
    > drivers/staging/hv/hv_timesource.c | 102 -----------------------------------
    > 4 files changed, 104 insertions(+), 103 deletions(-)
    > create mode 100644 drivers/clocksource/hv_timesource.c
    > delete mode 100644 drivers/staging/hv/hv_timesource.c
    >
    > diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
    > index be61ece..ea44327 100644
    > --- a/drivers/clocksource/Makefile
    > +++ b/drivers/clocksource/Makefile
    > @@ -6,3 +6,4 @@ obj-$(CONFIG_CS5535_CLOCK_EVENT_SRC) += cs5535-clockevt.o
    > obj-$(CONFIG_SH_TIMER_CMT) += sh_cmt.o
    > obj-$(CONFIG_SH_TIMER_MTU2) += sh_mtu2.o
    > obj-$(CONFIG_SH_TIMER_TMU) += sh_tmu.o
    > +obj-$(CONFIG_HYPERV) += hv_timesource.o
    > diff --git a/drivers/clocksource/hv_timesource.c b/drivers/clocksource/hv_timesource.c
    > new file mode 100644
    > index 0000000..0efb049
    > --- /dev/null
    > +++ b/drivers/clocksource/hv_timesource.c
    > @@ -0,0 +1,102 @@
    > +/*
    > + * A clocksource for Linux running on HyperV.
    > + *
    > + *
    > + * Copyright (C) 2010, Novell, Inc.
    > + * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
    > + *
    > + * This program is free software; you can redistribute it and/or modify
    > + * it under the terms of the GNU General Public License version 2 as
    > + * published by the Free Software Foundation.
    > + *
    > + * This program is distributed in the hope that it will be useful, but
    > + * WITHOUT ANY WARRANTY; without even the implied warranty of
    > + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
    > + * NON INFRINGEMENT. See the GNU General Public License for more
    > + * details.
    > + *
    > + * You should have received a copy of the GNU General Public License
    > + * along with this program; if not, write to the Free Software
    > + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    > + *
    > + */
    > +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
    > +
    > +#include <linux/version.h>
    > +#include <linux/clocksource.h>
    > +#include <linux/init.h>
    > +#include <linux/module.h>
    > +#include <linux/pci.h>
    > +#include <linux/dmi.h>
    > +#include <asm/hyperv.h>
    > +#include <asm/mshyperv.h>
    > +#include <asm/hypervisor.h>
    > +
    > +#define HV_CLOCK_SHIFT 22
    > +
    > +static cycle_t read_hv_clock(struct clocksource *arg)
    > +{
    > + cycle_t current_tick;
    > + /*
    > + * Read the partition counter to get the current tick count. This count
    > + * is set to 0 when the partition is created and is incremented in
    > + * 100 nanosecond units.
    > + */
    > + rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick);
    > + return current_tick;
    > +}
    > +
    > +static struct clocksource hyperv_cs = {
    > + .name = "hyperv_clocksource",
    > + .rating = 400, /* use this when running on Hyperv*/
    > + .read = read_hv_clock,
    > + .mask = CLOCKSOURCE_MASK(64),
    > + /*
    > + * The time ref counter in HyperV is in 100ns units.
    > + * The definition of mult is:
    > + * mult/2^shift = ns/cyc = 100
    > + * mult = (100 << shift)
    > + */
    > + .mult = (100 << HV_CLOCK_SHIFT),
    > + .shift = HV_CLOCK_SHIFT,

    The mult/shift assignments can be dropped. Please use
    clocksource_register_hz/khz() which will assign mult/shift for you.

    Otherwise it looks pretty straightforward.


    > +module_init(init_hv_clocksource);
    > +MODULE_DESCRIPTION("HyperV based clocksource");
    > +MODULE_AUTHOR("K. Y. Srinivasan <ksrinivasan@novell.com>");
    > +MODULE_LICENSE("GPL");

    One other nit: Should this email address be updated to your current one?

    thanks
    -john




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