From: Ingo Molnar <mingo@kernel.org>
Date: Sun, 26 Apr 2015 12:43:44 +0000 (+0200)
Subject: x86/fpu: Move !FPU check ingo fpu__init_system_early_generic()
X-Git-Tag: firefly_0821_release~176^2~1627^2~132
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e83ab9ad97a702917cb018e6c5a7d1176ff95305;p=firefly-linux-kernel-4.4.55.git

x86/fpu: Move !FPU check ingo fpu__init_system_early_generic()

There's a !FPU related sanity check in fpu__init_cpu_generic(),
which is executed on every CPU onlining - even though we should do
this only once, and during system init.

Move this check to fpu__init_system_early_generic().

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c
index 3637c509956d..69cdadd49ddf 100644
--- a/arch/x86/kernel/fpu/init.c
+++ b/arch/x86/kernel/fpu/init.c
@@ -85,6 +85,15 @@ static void fpu__init_system_early_generic(struct cpuinfo_x86 *c)
 		set_cpu_cap(c, X86_FEATURE_FPU);
 	else
 		clear_cpu_cap(c, X86_FEATURE_FPU);
+
+#ifndef CONFIG_MATH_EMULATION
+	if (!cpu_has_fpu) {
+		pr_emerg("No FPU found and no math emulation present\n");
+		pr_emerg("Giving up\n");
+		for (;;)
+			asm volatile("hlt");
+	}
+#endif
 }
 
 /*
@@ -180,14 +189,6 @@ static void fpu__init_cpu_generic(void)
 	unsigned long cr0;
 	unsigned long cr4_mask = 0;
 
-#ifndef CONFIG_MATH_EMULATION
-	if (!cpu_has_fpu) {
-		pr_emerg("No FPU found and no math emulation present\n");
-		pr_emerg("Giving up\n");
-		for (;;)
-			asm volatile("hlt");
-	}
-#endif
 	if (cpu_has_fxsr)
 		cr4_mask |= X86_CR4_OSFXSR;
 	if (cpu_has_xmm)