x86: I/O APIC: remove an IRQ2-mask hack

Now that IRQ2 is never made available to the I/O APIC, there is no need
to special-case it and mask as a workaround for broken systems.  Actually,
because of the former, mask_IO_APIC_irq(2) is a no-op already.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/acpi/boot.c

@@ -1409,7 +1409,6 @@ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
 {
 	pr_notice("%s detected: Ignoring BIOS IRQ0 pin2 override\n", d->ident);
 	acpi_skip_timer_override = 1;
-	force_mask_ioapic_irq_2();
 	return 0;
 }
 

arch/x86/kernel/io_apic_32.c

@@ -59,13 +59,6 @@ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
 static DEFINE_SPINLOCK(ioapic_lock);
 static DEFINE_SPINLOCK(vector_lock);
 
-static bool mask_ioapic_irq_2 __initdata;
-
-void __init force_mask_ioapic_irq_2(void)
-{
-	mask_ioapic_irq_2 = true;
-}
-
 int timer_through_8259 __initdata;
 
 /*
@@ -2187,9 +2180,6 @@ static inline void __init check_timer(void)
 	printk(KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
 		vector, apic1, pin1, apic2, pin2);
 
-	if (mask_ioapic_irq_2)
-		mask_IO_APIC_irq(2);
-
 	/*
 	 * Some BIOS writers are clueless and report the ExtINTA
 	 * I/O APIC input from the cascaded 8259A as the timer

arch/x86/kernel/io_apic_64.c

@@ -94,13 +94,6 @@ static int no_timer_check;
 
 static int disable_timer_pin_1 __initdata;
 
-static bool mask_ioapic_irq_2 __initdata;
-
-void __init force_mask_ioapic_irq_2(void)
-{
-	mask_ioapic_irq_2 = true;
-}
-
 int timer_through_8259 __initdata;
 
 /* Where if anywhere is the i8259 connect in external int mode */
@@ -1706,9 +1699,6 @@ static inline void __init check_timer(void)
 	apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
 		cfg->vector, apic1, pin1, apic2, pin2);
 
-	if (mask_ioapic_irq_2)
-		mask_IO_APIC_irq(2);
-
 	/*
 	 * Some BIOS writers are clueless and report the ExtINTA
 	 * I/O APIC input from the cascaded 8259A as the timer

include/asm-x86/genapic_32.h

@@ -119,10 +119,5 @@ enum uv_system_type {UV_NONE, UV_LEGACY_APIC, UV_X2APIC, UV_NON_UNIQUE_APIC};
 #define is_uv_system()			0
 #define uv_wakeup_secondary(a, b)	1
 
-#ifdef CONFIG_X86_IO_APIC
-extern void force_mask_ioapic_irq_2(void);
-#else
-static inline void force_mask_ioapic_irq_2(void) { }
-#endif
 
 #endif

include/asm-x86/genapic_64.h

@@ -46,10 +46,4 @@ extern int uv_wakeup_secondary(int phys_apicid, unsigned int start_rip);
 
 extern void setup_apic_routing(void);
 
-#ifdef CONFIG_X86_IO_APIC
-extern void force_mask_ioapic_irq_2(void);
-#else
-static inline void force_mask_ioapic_irq_2(void) { }
-#endif
-
 #endif