x86/ioapic.c: unify __mask_IO_APIC_irq()

The main difference between 32 and 64-bit __mask_IO_APIC_irq() does a
readback from the I/O APIC to synchronize it.

If there's a hardware requirement to do a readback sync after updating
an APIC register, then it will be a hardware requrement regardless of
whether the kernel is compiled 32 or 64-bit.

Unify __mask_IO_APIC_irq() using the 64-bit version which always syncs
with io_apic_sync().

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

1 files changed, 1 insertions, 6 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 82271eb87bb0..f8aa5461071b 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -580,7 +580,6 @@ static void __unmask_IO_APIC_irq(struct irq_cfg *cfg)
         io_apic_modify_irq(cfg, ~IO_APIC_REDIR_MASKED, 0, NULL);
 }
 
-#ifdef CONFIG_X86_64
 static void io_apic_sync(struct irq_pin_list *entry)
 {
         /*
@@ -596,12 +595,8 @@ static void __mask_IO_APIC_irq(struct irq_cfg *cfg)
 {
         io_apic_modify_irq(cfg, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
 }
-#else /* CONFIG_X86_32 */
-static void __mask_IO_APIC_irq(struct irq_cfg *cfg)
-{
-        io_apic_modify_irq(cfg, ~0, IO_APIC_REDIR_MASKED, NULL);
-}
 
+#ifdef CONFIG_X86_32
 static void __mask_and_edge_IO_APIC_irq(struct irq_cfg *cfg)
 {
         io_apic_modify_irq(cfg, ~IO_APIC_REDIR_LEVEL_TRIGGER,