From: Ingo Molnar <mingo@kernel.org>
Date: Sat, 25 Apr 2015 07:02:51 +0000 (+0200)
Subject: x86/fpu: Move all eager-fpu setup code to eager_fpu_init()
X-Git-Tag: firefly_0821_release~176^2~1627^2~145
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=89abbe01a46a9f47f8d07e2817704bfcbd8f6f9e;p=firefly-linux-kernel-4.4.55.git

x86/fpu: Move all eager-fpu setup code to eager_fpu_init()

The FPU context switch type (lazy or eager) setup code is split into
two places currently - move it all to eager_fpu_init().

Note that the code we move will now be executed on non-xstate CPUs
as well, but this should be safe: both xfeatures_mask and
cpu_has_xsaveopt is 0 there.

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 097f03e209a6..1b920a170576 100644
--- a/arch/x86/kernel/fpu/xsave.c
+++ b/arch/x86/kernel/fpu/xsave.c
@@ -686,20 +686,6 @@ void fpu__init_system_xstate(void)
 	prepare_fx_sw_frame();
 	setup_init_fpu_buf();
 
-	/* Auto enable eagerfpu for xsaveopt */
-	if (cpu_has_xsaveopt && eagerfpu != DISABLE)
-		eagerfpu = ENABLE;
-
-	if (xfeatures_mask & XSTATE_EAGER) {
-		if (eagerfpu == DISABLE) {
-			pr_err("x86/fpu: eagerfpu switching disabled, disabling the following xstate features: 0x%llx.\n",
-			       xfeatures_mask & XSTATE_EAGER);
-			xfeatures_mask &= ~XSTATE_EAGER;
-		} else {
-			eagerfpu = ENABLE;
-		}
-	}
-
 	pr_info("x86/fpu: Enabled xstate features 0x%llx, context size is 0x%x bytes, using '%s' format.\n",
 		xfeatures_mask,
 		xstate_size,
@@ -715,6 +701,20 @@ void __init_refok eager_fpu_init(void)
 	WARN_ON(current->thread.fpu.fpstate_active);
 	current_thread_info()->status = 0;
 
+	/* Auto enable eagerfpu for xsaveopt */
+	if (cpu_has_xsaveopt && eagerfpu != DISABLE)
+		eagerfpu = ENABLE;
+
+	if (xfeatures_mask & XSTATE_EAGER) {
+		if (eagerfpu == DISABLE) {
+			pr_err("x86/fpu: eagerfpu switching disabled, disabling the following xstate features: 0x%llx.\n",
+			       xfeatures_mask & XSTATE_EAGER);
+			xfeatures_mask &= ~XSTATE_EAGER;
+		} else {
+			eagerfpu = ENABLE;
+		}
+	}
+
 	if (eagerfpu == ENABLE)
 		setup_force_cpu_cap(X86_FEATURE_EAGER_FPU);