[tip:x86/apic] x86, irq: Split out alloc_ioapic_save_registers()

tip-bot for Yinghai Lu
2014-12-19T14:04:16Z

Commit-ID: 7e8994196a5196fbe6f344ff9f0616e08d440506
Gitweb: http://git.kernel.org/tip/7e8994196a5196fbe6f344ff9f0616e08d440506
Author: Yinghai Lu <yinghai@kernel.org>
AuthorDate: Mon, 27 Oct 2014 13:21:39 +0800
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Tue, 16 Dec 2014 14:08:15 +0100

x86, irq: Split out alloc_ioapic_save_registers()

Split out alloc_ioapic_save_registers() from early_irq_init(),
so it could be used for ioapic hotplug later.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
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: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
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: Borislav Petkov <bp@alien8.de>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Link: http://lkml.kernel.org/r/1414387308-27148-10-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
arch/x86/kernel/apic/io_apic.c | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index a157b66..654b69b 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -237,6 +237,19 @@ static struct irq_pin_list *alloc_irq_pin_list(int node)
return kzalloc_node(sizeof(struct irq_pin_list), GFP_KERNEL, node);
}

+static void alloc_ioapic_saved_registers(int idx)
+{
+ size_t size;
+
+ if (ioapics[idx].saved_registers)
+ return;
+
+ size = sizeof(struct IO_APIC_route_entry) * ioapics[idx].nr_registers;
+ ioapics[idx].saved_registers = kzalloc(size, GFP_KERNEL);
+ if (!ioapics[idx].saved_registers)
+ pr_err("IOAPIC %d: suspend/resume impossible!\n", idx);
+}
+
int __init arch_early_irq_init(void)
{
struct irq_cfg *cfg;
@@ -245,13 +258,8 @@ int __init arch_early_irq_init(void)
if (!nr_legacy_irqs())
io_apic_irqs = ~0UL;

- for_each_ioapic(i) {
- ioapics[i].saved_registers =
- kzalloc(sizeof(struct IO_APIC_route_entry) *
- ioapics[i].nr_registers, GFP_KERNEL);
- if (!ioapics[i].saved_registers)
- pr_err("IOAPIC %d: suspend/resume impossible!\n", i);
- }
+ for_each_ioapic(i)
+ alloc_ioapic_saved_registers(i);

/*
* For legacy IRQ's, start with assigning irq0 to irq15 to