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Subject[PATCH v3 1/4] drivers/clocksource/hyper-v: Introduce a pointer to TSC page
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From: Stanislav Kinsburskiy <stanislav.kinsburskiy@gmail.com>

Will be used later keep the address of the remapped page for the root
partition as it will be Microsoft Hypervisor defined (and thus won't be a
static address).

Signed-off-by: Stanislav Kinsburskiy <stanislav.kinsburskiy@gmail.com>
CC: "K. Y. Srinivasan" <kys@microsoft.com>
CC: Haiyang Zhang <haiyangz@microsoft.com>
CC: Wei Liu <wei.liu@kernel.org>
CC: Dexuan Cui <decui@microsoft.com>
CC: Daniel Lezcano <daniel.lezcano@linaro.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: linux-hyperv@vger.kernel.org
CC: linux-kernel@vger.kernel.org
---
drivers/clocksource/hyperv_timer.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index 18de1f439ffd..b0b5df576e17 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -367,9 +367,11 @@ static union {
u8 reserved[PAGE_SIZE];
} tsc_pg __aligned(PAGE_SIZE);

+static struct ms_hyperv_tsc_page *tsc_page = &tsc_pg.page;
+
struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
{
- return &tsc_pg.page;
+ return tsc_page;
}
EXPORT_SYMBOL_GPL(hv_get_tsc_page);

@@ -407,7 +409,7 @@ static void suspend_hv_clock_tsc(struct clocksource *arg)

static void resume_hv_clock_tsc(struct clocksource *arg)
{
- phys_addr_t phys_addr = virt_to_phys(&tsc_pg);
+ phys_addr_t phys_addr = virt_to_phys(tsc_page);
union hv_reference_tsc_msr tsc_msr;

/* Re-enable the TSC page */

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