x86, 386 removal: Remove support for IRQ 13 FPU error reporting

[karo-tx-linux.git] / arch / x86 / kernel / irqinit.c

diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 6e03b0d6913817a312f72f016b027c46756197ff..7dc4e459c2b389c2126d679d1692856ea4caddb0 100644 (file)
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -42,39 +42,6 @@
  * (these are usually mapped into the 0x30-0xff vector range)
  */
 
-#ifdef CONFIG_X86_32
-/*
- * Note that on a 486, we don't want to do a SIGFPE on an irq13
- * as the irq is unreliable, and exception 16 works correctly
- * (ie as explained in the intel literature). On a 386, you
- * can't use exception 16 due to bad IBM design, so we have to
- * rely on the less exact irq13.
- *
- * Careful.. Not only is IRQ13 unreliable, but it is also
- * leads to races. IBM designers who came up with it should
- * be shot.
- */
-
-static irqreturn_t math_error_irq(int cpl, void *dev_id)
-{
-       outb(0, 0xF0);
-       if (ignore_fpu_irq || !boot_cpu_data.hard_math)
-               return IRQ_NONE;
-       math_error(get_irq_regs(), 0, X86_TRAP_MF);
-       return IRQ_HANDLED;
-}
-
-/*
- * New motherboards sometimes make IRQ 13 be a PCI interrupt,
- * so allow interrupt sharing.
- */
-static struct irqaction fpu_irq = {
-       .handler = math_error_irq,
-       .name = "fpu",
-       .flags = IRQF_NO_THREAD,
-};
-#endif
-
 /*
  * IRQ2 is cascade interrupt to second interrupt controller
  */
@@ -242,13 +209,6 @@ void __init native_init_IRQ(void)
                setup_irq(2, &irq2);
 
 #ifdef CONFIG_X86_32
-       /*
-        * External FPU? Set up irq13 if so, for
-        * original braindamaged IBM FERR coupling.
-        */
-       if (boot_cpu_data.hard_math && !cpu_has_fpu)
-               setup_irq(FPU_IRQ, &fpu_irq);
-
        irq_ctx_init(smp_processor_id());
 #endif
 }