Commit 2507e1c0 authored Apr 25, 2015 by Ingo Molnar

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>

parent 429ced50

arch/x86/kernel/fpu/init.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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();

arch/x86/kernel/fpu/xsave.c

+0 −6

Original line number	Diff line number	Diff line
		@@ -576,12 +576,6 @@ static void setup_init_fpu_buf(void)
		return;
		on_boot_cpu = 0;

		/*
		* Setup init_xstate_ctx to represent the init state of
		* all the features managed by the xsave
		*/
		fx_finit(&init_xstate_ctx.i387);

		if (!cpu_has_xsave)
		return;