x86/fpu: Make the system/cpu init distinction clear in the xstate code as well

Rename existing xstate init functions along the system/cpu init principles:

	fpu__init_system_xstate(): called once per system bootup
	fpu__init_cpu_xstate():    called per CPU onlining

Also make the fpu__init_cpu_xstate() early code invariant:
if xfeatures_mask is not set yet then don't crash but return.

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/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 19b7cdf..71d44be 100644 (file)
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -39,6 +39,9 @@ extern unsigned int mxcsr_feature_mask;
 extern void fpu__cpu_init(void);
 extern void eager_fpu_init(void);
 
+extern void fpu__init_system_xstate(void);
+extern void fpu__init_cpu_xstate(void);
+
 DECLARE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx);
 
 extern void convert_from_fxsr(struct user_i387_ia32_struct *env,

diff --cc arch/x86/kernel/fpu/xsave.c
Simple merge