From: Ingo Molnar <mingo@kernel.org>
Date: Sat, 25 Apr 2015 04:41:07 +0000 (+0200)
Subject: x86/fpu: Move CPU capability check into fpu__init_cpu_xstate()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e84611fc96c67d3a073e327be44d0f9ee3e981ef;p=openwrt%2Fstaging%2Fblogic.git

x86/fpu: Move CPU capability check into fpu__init_cpu_xstate()

fpu__init_system_xstate() does an FPU capability check that is better
done in fpu__init_cpu_xstate(). This will allow us to call
fpu__init_cpu_xstate() directly on legacy CPUs as well.

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/xsave.c b/arch/x86/kernel/fpu/xsave.c
index 961c25850c7f..0610f431f77f 100644
--- a/arch/x86/kernel/fpu/xsave.c
+++ b/arch/x86/kernel/fpu/xsave.c
@@ -465,7 +465,7 @@ static void prepare_fx_sw_frame(void)
  */
 void fpu__init_cpu_xstate(void)
 {
-	if (!xfeatures_mask)
+	if (!cpu_has_xsave || !xfeatures_mask)
 		return;
 
 	cr4_set_bits(X86_CR4_OSXSAVE);