Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 FPU changes from Ingo Molnar:
 "There are two bigger changes in this tree:

   - Add an [early-use-]safe static_cpu_has() variant and other
     robustness improvements, including the new X86_DEBUG_STATIC_CPU_HAS
     configurable debugging facility, motivated by recent obscure FPU
     code bugs, by Borislav Petkov

   - Reimplement FPU detection code in C and drop the old asm code, by
     Peter Anvin."

* 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, fpu: Use static_cpu_has_safe before alternatives
  x86: Add a static_cpu_has_safe variant
  x86: Sanity-check static_cpu_has usage
  x86, cpu: Add a synthetic, always true, cpu feature
  x86: Get rid of ->hard_math and all the FPU asm fu

1 files changed, 17 insertions, 2 deletions

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 22018f70a67..a4a07c0acb1 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -711,10 +711,9 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
 		return;
 
 	cpu_detect(c);
-
 	get_cpu_vendor(c);
-
 	get_cpu_cap(c);
+	fpu_detect(c);
 
 	if (this_cpu->c_early_init)
 		this_cpu->c_early_init(c);
@@ -724,6 +723,8 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
 
 	if (this_cpu->c_bsp_init)
 		this_cpu->c_bsp_init(c);
+
+	setup_force_cpu_cap(X86_FEATURE_ALWAYS);
 }
 
 void __init early_cpu_init(void)
@@ -1363,3 +1364,17 @@ void __cpuinit cpu_init(void)
 	fpu_init();
 }
 #endif
+
+#ifdef CONFIG_X86_DEBUG_STATIC_CPU_HAS
+void warn_pre_alternatives(void)
+{
+	WARN(1, "You're using static_cpu_has before alternatives have run!\n");
+}
+EXPORT_SYMBOL_GPL(warn_pre_alternatives);
+#endif
+
+inline bool __static_cpu_has_safe(u16 bit)
+{
+	return boot_cpu_has(bit);
+}
+EXPORT_SYMBOL_GPL(__static_cpu_has_safe);