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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [linux-2.6.18-xen] linux/acpi: adjust extcntl code so that CONFIG_ACPI_PROCESSOR=m is possible again
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1216816650 -3600
# Node ID 72234a8ee99cb0f56c856f28ffbe2b10d2ea1ebc
# Parent 268d6984c8e2b3ecf02a609dc832253b042c64da
linux/acpi: adjust extcntl code so that CONFIG_ACPI_PROCESSOR=m is possible
again
This is done by inverting the calling direction for registering the
extcntl_ops structure, similar to arch_acpi_processor_init_pdc().
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
arch/i386/kernel/acpi/processor_extcntl_xen.c | 8 ++--
drivers/acpi/Kconfig | 1
drivers/acpi/processor_extcntl.c | 50 +++++++-------------------
include/acpi/processor.h | 5 +-
4 files changed, 20 insertions(+), 44 deletions(-)
diff -r 268d6984c8e2 -r 72234a8ee99c
arch/i386/kernel/acpi/processor_extcntl_xen.c
--- a/arch/i386/kernel/acpi/processor_extcntl_xen.c Wed Jul 23 13:36:53
2008 +0100
+++ b/arch/i386/kernel/acpi/processor_extcntl_xen.c Wed Jul 23 13:37:30
2008 +0100
@@ -221,7 +221,7 @@ static struct processor_extcntl_ops xen_
.hotplug = xen_hotplug_notifier,
};
-static int __cpuinit xen_init_processor_extcntl(void)
+void arch_acpi_processor_init_extcntl(const struct processor_extcntl_ops **ops)
{
if (xen_processor_pmbits & XEN_PROCESSOR_PM_CX)
xen_extcntl_ops.pm_ops[PM_TYPE_IDLE] = xen_cx_notifier;
@@ -230,6 +230,6 @@ static int __cpuinit xen_init_processor_
if (xen_processor_pmbits & XEN_PROCESSOR_PM_TX)
xen_extcntl_ops.pm_ops[PM_TYPE_THR] = xen_tx_notifier;
- return processor_register_extcntl(&xen_extcntl_ops);
-}
-core_initcall(xen_init_processor_extcntl);
+ *ops = &xen_extcntl_ops;
+}
+EXPORT_SYMBOL(arch_acpi_processor_init_extcntl);
diff -r 268d6984c8e2 -r 72234a8ee99c drivers/acpi/Kconfig
--- a/drivers/acpi/Kconfig Wed Jul 23 13:36:53 2008 +0100
+++ b/drivers/acpi/Kconfig Wed Jul 23 13:37:30 2008 +0100
@@ -371,7 +371,6 @@ config PROCESSOR_EXTERNAL_CONTROL
config PROCESSOR_EXTERNAL_CONTROL
bool
depends on X86 && XEN
- select ACPI_PROCESSOR
default y
endif # ACPI
diff -r 268d6984c8e2 -r 72234a8ee99c drivers/acpi/processor_extcntl.c
--- a/drivers/acpi/processor_extcntl.c Wed Jul 23 13:36:53 2008 +0100
+++ b/drivers/acpi/processor_extcntl.c Wed Jul 23 13:37:30 2008 +0100
@@ -36,7 +36,7 @@ static int processor_extcntl_get_perform
* External processor control logic may register with its own set of
* ops to get ACPI related notification. One example is like VMM.
*/
-struct processor_extcntl_ops *processor_extcntl_ops;
+const struct processor_extcntl_ops *processor_extcntl_ops;
EXPORT_SYMBOL(processor_extcntl_ops);
static int processor_notify_smm(void)
@@ -105,47 +105,13 @@ int processor_notify_external(struct acp
}
/*
- * External control logic can decide to grab full or part of physical
- * processor control bits. Take a VMM for example, physical processors
- * are owned by VMM and thus existence information like hotplug is
- * always required to be notified to VMM. Similar is processor idle
- * state which is also necessarily controlled by VMM. But for other
- * control bits like performance/throttle states, VMM may choose to
- * control or not upon its own policy.
- *
- * Such ownership is unlikely to be switched in the fly, and thus
- * not sure unregister interface is required or not. Being same reason,
- * lock is not forced now.
- */
-int processor_register_extcntl(struct processor_extcntl_ops *ops)
-{
- if (!ops)
- return -EINVAL;
-
- if (processor_extcntl_ops &&
- (processor_extcntl_ops != ops))
- return -EBUSY;
-
- processor_extcntl_ops = ops;
- return 0;
-}
-
-int processor_unregister_extcntl(struct processor_extcntl_ops *ops)
-{
- if (processor_extcntl_ops == ops)
- processor_extcntl_ops = NULL;
-
- return 0;
-}
-
-/*
* This is called from ACPI processor init, and targeted to hold
* some tricky housekeeping jobs to satisfy external control model.
* For example, we may put dependency parse stub here for idle
* and performance state. Those information may be not available
* if splitting from dom0 control logic like cpufreq driver.
*/
-int processor_extcntl_init(struct acpi_processor *pr)
+int __cpuinit processor_extcntl_init(struct acpi_processor *pr)
{
/* parse cstate dependency information */
if (processor_pm_external())
@@ -154,6 +120,18 @@ int processor_extcntl_init(struct acpi_p
/* Initialize performance states */
if (processor_pmperf_external())
processor_extcntl_get_performance(pr);
+
+ /*
+ * External control logic can decide to grab full or part of physical
+ * processor control bits. Take a VMM for example, physical processors
+ * are owned by VMM and thus existence information like hotplug is
+ * always required to be notified to VMM. Similar is processor idle
+ * state which is also necessarily controlled by VMM. But for other
+ * control bits like performance/throttle states, VMM may choose to
+ * control or not upon its own policy.
+ */
+ if (!processor_extcntl_ops)
+ arch_acpi_processor_init_extcntl(&processor_extcntl_ops);
return 0;
}
diff -r 268d6984c8e2 -r 72234a8ee99c include/acpi/processor.h
--- a/include/acpi/processor.h Wed Jul 23 13:36:53 2008 +0100
+++ b/include/acpi/processor.h Wed Jul 23 13:37:30 2008 +0100
@@ -323,7 +323,7 @@ struct processor_extcntl_ops {
/* Notify physical processor status to external control logic */
int (*hotplug)(struct acpi_processor *pr, int event);
};
-extern struct processor_extcntl_ops *processor_extcntl_ops;
+extern const struct processor_extcntl_ops *processor_extcntl_ops;
static inline int processor_cntl_external(void)
{
@@ -350,11 +350,10 @@ static inline int processor_pmthr_extern
extern int processor_notify_external(struct acpi_processor *pr,
int event, int type);
-extern int processor_register_extcntl(struct processor_extcntl_ops *ops);
-extern int processor_unregister_extcntl(struct processor_extcntl_ops *ops);
extern int processor_extcntl_init(struct acpi_processor *pr);
extern int acpi_processor_get_performance_info(struct acpi_processor *pr);
extern int acpi_processor_get_psd(struct acpi_processor *pr);
+void arch_acpi_processor_init_extcntl(const struct processor_extcntl_ops **);
#else
static inline int processor_cntl_external(void) {return 0;}
static inline int processor_pm_external(void) {return 0;}
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