iommu/irq_remapping: Kill function irq_remapping_supported() and related code

Simplify irq_remapping code by killing irq_remapping_supported() and
related interfaces.

Joerg posted a similar patch at https://lkml.org/lkml/2014/12/15/490,
so assume an signed-off from Joerg.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Joerg Roedel <joro@8bytes.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: H. Peter Anvin <hpa@linux.intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Rientjes <rientjes@google.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Oren Twaig <oren@scalemp.com>
Link: http://lkml.kernel.org/r/1420615903-28253-14-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 6 deletions

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 2f16116ced90..35e6d09294ed 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1575,12 +1575,7 @@ void enable_x2apic(void)
 
 static int __init try_to_enable_IR(void)
 {
-#ifdef CONFIG_IRQ_REMAP
-        if (!irq_remapping_supported()) {
-                pr_debug("intr-remapping not supported\n");
-                return -1;
-        }
-
+#ifdef CONFIG_X86_IO_APIC
         if (!x2apic_enabled() && skip_ioapic_setup) {
                 pr_info("Skipped enabling intr-remap because of skipping "
                         "io-apic setup\n");