xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86, irq: Introduce helper to check whether an IOAPIC has been registered

Browse Source 
Introduce acpi_ioapic_registered() to check whether an IOAPIC has already
been registered, it will be used when enabling IOAPIC hotplug.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Len Brown <len.brown@intel.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Link: http://lkml.kernel.org/r/1414387308-27148-18-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu
2014-10-27 13:21:47 +08:00
committed by Thomas Gleixner
parent 15516a3b86
commit e89900c9ad
4 changed files with 35 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
arch/x86/kernel/acpi/boot.c
View File

@@ -826,6 +826,28 @@ int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
}
EXPORT_SYMBOL(acpi_unregister_ioapic);
/**
* acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
* has been registered
* @handle: ACPI handle of the IOAPIC deivce
* @gsi_base: GSI base associated with the IOAPIC
*
* Assume caller holds some type of lock to serialize acpi_ioapic_registered()
* with acpi_register_ioapic()/acpi_unregister_ioapic().
*/
int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
{
int ret = 0;
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
mutex_lock(&acpi_ioapic_lock);
ret = mp_ioapic_registered(gsi_base);
mutex_unlock(&acpi_ioapic_lock);
#endif
return ret;
}
static int __init acpi_parse_sbf(struct acpi_table_header *table)
{
struct acpi_table_boot *sb;