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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-19 22:02:23 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-19 22:02:23 +0100
commit1bd12c91de35756129b8ffe28a4fe45177b86381 (patch)
tree4217aef46c19c963b44b202382beeddd3063fa5a
parentMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/ker... (diff)
parentx86, 386 removal: Remove support for IRQ 13 FPU error reporting (diff)
downloadlinux-1bd12c91de35756129b8ffe28a4fe45177b86381.tar.xz
linux-1bd12c91de35756129b8ffe28a4fe45177b86381.zip
Merge branch 'x86/nuke386' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull one final 386 removal patch from Peter Anvin. IRQ 13 FPU error handling is gone. That was not one of the proudest moments in PC history. * 'x86/nuke386' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, 386 removal: Remove support for IRQ 13 FPU error reporting
-rw-r--r--arch/x86/kernel/cpu/proc.c7
-rw-r--r--arch/x86/kernel/irqinit.c40
-rw-r--r--arch/x86/kernel/traps.c6
3 files changed, 1 insertions, 52 deletions
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index fbd895562292..3286a92e662a 100644
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -26,11 +26,6 @@ static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
#ifdef CONFIG_X86_32
static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
{
- /*
- * We use exception 16 if we have hardware math and we've either seen
- * it or the CPU claims it is internal
- */
- int fpu_exception = c->hard_math && (ignore_fpu_irq || cpu_has_fpu);
seq_printf(m,
"fdiv_bug\t: %s\n"
"hlt_bug\t\t: %s\n"
@@ -45,7 +40,7 @@ static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
c->f00f_bug ? "yes" : "no",
c->coma_bug ? "yes" : "no",
c->hard_math ? "yes" : "no",
- fpu_exception ? "yes" : "no",
+ c->hard_math ? "yes" : "no",
c->cpuid_level,
c->wp_works_ok ? "yes" : "no");
}
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 6e03b0d69138..7dc4e459c2b3 100644
--- 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
}
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index eb8586693e0b..ecffca11f4e9 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -69,9 +69,6 @@
asmlinkage int system_call(void);
-/* Do we ignore FPU interrupts ? */
-char ignore_fpu_irq;
-
/*
* The IDT has to be page-aligned to simplify the Pentium
* F0 0F bug workaround.
@@ -564,9 +561,6 @@ void math_error(struct pt_regs *regs, int error_code, int trapnr)
dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code)
{
-#ifdef CONFIG_X86_32
- ignore_fpu_irq = 1;
-#endif
exception_enter(regs);
math_error(regs, error_code, X86_TRAP_MF);
exception_exit(regs);