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.comSigned-off-by: Thomas Gleixner <tglx@linutronix.de>
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