linux-kernel - [tip:x86/fpu] x86-32, fpu: Remove math

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Message-ID: <tip-a334fe43d85f570ae907acf988a053c5eff78d6e@git.kernel.org>
Date:	Fri, 10 Sep 2010 01:48:39 GMT
From:	tip-bot for Brian Gerst <brgerst@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	brgerst@...il.com, penberg@...nel.org, suresh.b.siddha@...el.com,
	tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/fpu] x86-32, fpu: Remove math_emulate stub

Commit-ID:  a334fe43d85f570ae907acf988a053c5eff78d6e
Gitweb:     http://git.kernel.org/tip/a334fe43d85f570ae907acf988a053c5eff78d6e
Author:     Brian Gerst <brgerst@...il.com>
AuthorDate: Fri, 3 Sep 2010 21:17:15 -0400
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Thu, 9 Sep 2010 14:17:11 -0700

x86-32, fpu: Remove math_emulate stub

check_fpu() in bugs.c halts boot if no FPU is found and math emulation
isn't enabled.  Therefore this stub will never be used.

Signed-off-by: Brian Gerst <brgerst@...il.com>
Acked-by: Pekka Enberg <penberg@...nel.org>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
LKML-Reference: <1283563039-3466-9-git-send-email-brgerst@...il.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/kernel/traps.c |   23 ++++++-----------------
 1 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index d0029eb..d439685 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -776,21 +776,10 @@ asmlinkage void math_state_restore(void)
 }
 EXPORT_SYMBOL_GPL(math_state_restore);
 
-#ifndef CONFIG_MATH_EMULATION
-void math_emulate(struct math_emu_info *info)
-{
-	printk(KERN_EMERG
-		"math-emulation not enabled and no coprocessor found.\n");
-	printk(KERN_EMERG "killing %s.\n", current->comm);
-	force_sig(SIGFPE, current);
-	schedule();
-}
-#endif /* CONFIG_MATH_EMULATION */
-
 dotraplinkage void __kprobes
 do_device_not_available(struct pt_regs *regs, long error_code)
 {
-#ifdef CONFIG_X86_32
+#ifdef CONFIG_MATH_EMULATION
 	if (read_cr0() & X86_CR0_EM) {
 		struct math_emu_info info = { };
 
@@ -798,12 +787,12 @@ do_device_not_available(struct pt_regs *regs, long error_code)
 
 		info.regs = regs;
 		math_emulate(&info);
-	} else {
-		math_state_restore(); /* interrupts still off */
-		conditional_sti(regs);
+		return;
 	}
-#else
-	math_state_restore();
+#endif
+	math_state_restore(); /* interrupts still off */
+#ifdef CONFIG_X86_32
+	conditional_sti(regs);
 #endif
 }
 
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