From: Ingo Molnar <mingo@kernel.org>
Date: Sat, 25 Apr 2015 06:35:53 +0000 (+0200)
Subject: x86/fpu: Set up the legacy FPU init image from fpu__init_system()
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~174^2~147
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2507e1c03f577173d613d6728329eb220724c577;p=pandora-kernel.git

x86/fpu: Set up the legacy FPU init image from fpu__init_system()

The legacy FPU init image is used on older CPUs who don't run xstate init.
But the init code is called within setup_init_fpu_buf(), an xstate method.

Move this legacy init out of the xstate code and put it into fpu/init.c.

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 c1b2d1cfe745..30d2d5d03cb0 100644
--- a/arch/x86/kernel/fpu/init.c
+++ b/arch/x86/kernel/fpu/init.c
@@ -158,6 +158,12 @@ void fpu__init_system(void)
 	/* The FPU has to be operational for some of the later FPU init activities: */
 	fpu__init_cpu();
 
+	/*
+	 * Set up the legacy init FPU context. (xstate init might overwrite this
+	 * with a more modern format, if the CPU supports it.)
+	 */
+	fx_finit(&init_xstate_ctx.i387);
+
 	mxcsr_feature_mask_init();
 	fpu__init_system_xstate();
 	eager_fpu_init();
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