From: Dexuan Cui <decui@microsoft.com>
To: "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
"lenb@kernel.org" <lenb@kernel.org>,
"robert.moore@intel.com" <robert.moore@intel.com>,
"erik.schmauss@intel.com" <erik.schmauss@intel.com>,
Michael Kelley <mikelley@microsoft.com>
Cc: "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
KY Srinivasan <kys@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Sasha Levin <Alexander.Levin@microsoft.com>,
"olaf@aepfle.de" <olaf@aepfle.de>,
"apw@canonical.com" <apw@canonical.com>,
"jasowang@redhat.com" <jasowang@redhat.com>,
vkuznets <vkuznets@redhat.com>,
"marcelo.cerri@canonical.com" <marcelo.cerri@canonical.com>,
Dexuan Cui <decui@microsoft.com>
Subject: [PATCH] ACPI: PM: Export the function acpi_sleep_state_supported()
Date: Fri, 14 Jun 2019 18:19:04 +0000 [thread overview]
Message-ID: <1560536224-35338-1-git-send-email-decui@microsoft.com> (raw)
In a Linux VM running on Hyper-V, when ACPI S4 is enabled, the balloon
driver (drivers/hv/hv_balloon.c) needs to ask the host not to do memory
hot-add/remove.
So let's export acpi_sleep_state_supported() for the hv_balloon driver.
This might also be useful to the other drivers in the future.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
---
drivers/acpi/sleep.c | 3 ++-
include/acpi/acpi_bus.h | 2 ++
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index a34deccd7317..69755411e008 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -79,7 +79,7 @@ static int acpi_sleep_prepare(u32 acpi_state)
return 0;
}
-static bool acpi_sleep_state_supported(u8 sleep_state)
+bool acpi_sleep_state_supported(u8 sleep_state)
{
acpi_status status;
u8 type_a, type_b;
@@ -89,6 +89,7 @@ static bool acpi_sleep_state_supported(u8 sleep_state)
|| (acpi_gbl_FADT.sleep_control.address
&& acpi_gbl_FADT.sleep_status.address));
}
+EXPORT_SYMBOL_GPL(acpi_sleep_state_supported);
#ifdef CONFIG_ACPI_SLEEP
static u32 acpi_target_sleep_state = ACPI_STATE_S0;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 31b6c87d6240..5b102e7bbf25 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -651,6 +651,8 @@ static inline int acpi_pm_set_bridge_wakeup(struct device *dev, bool enable)
}
#endif
+bool acpi_sleep_state_supported(u8 sleep_state);
+
#ifdef CONFIG_ACPI_SLEEP
u32 acpi_target_system_state(void);
#else
--
2.19.1
next reply other threads:[~2019-06-14 18:19 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-14 18:19 Dexuan Cui [this message]
2019-06-14 20:48 ` [PATCH] ACPI: PM: Export the function acpi_sleep_state_supported() Michael Kelley
2019-06-14 22:19 ` Dexuan Cui
2019-06-14 22:33 ` Russell King - ARM Linux admin
2019-06-14 23:34 ` Dexuan Cui
2019-06-17 13:08 ` Pavel Machek
2019-06-17 13:09 ` Pavel Machek
2019-06-17 16:14 ` Lorenzo Pieralisi
2019-06-19 19:54 ` Dexuan Cui
2019-06-20 11:30 ` Pavel Machek
2019-06-21 7:15 ` Dexuan Cui
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