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x86/fpu: Move the fpstate_xstate_init_size() call into fpu__init_system()

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The fpstate_xstate_init_size() function sets up a basic xstate_size, called
during fpu__detect() currently.

Its real dependency is to be called before fpu__init_system_xstate().

So move the function call site into fpu__init_system(), to right before the
fpu__init_system_xstate() call.

Also add a once-per-boot flag to fpstate_xstate_init_size(), we'll remove
this quirk later once we've cleaned up the init dependencies.

This moves the two related functions closer to each other and makes them
both part of the _init_system() functionality.

Currently we do the fpstate_xstate_init_size()
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>
This commit is contained in:
Ingo Molnar 2015-04-26 10:35:57 +02:00
parent 530b37e43c
commit 997578b14c
1 changed files with 9 additions and 2 deletions
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11
arch/x86/kernel/fpu/init.c
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@ -96,6 +96,12 @@ static void mxcsr_feature_mask_init(void)
static void fpstate_xstate_init_size(void)
{
static bool on_boot_cpu = 1;
if (!on_boot_cpu)
return;
on_boot_cpu = 0;
/*
* Note that xstate_size might be overwriten later during
* fpu__init_system_xstate().
@ -227,7 +233,10 @@ void fpu__init_system(void)
fx_finit(&init_xstate_ctx.i387);
mxcsr_feature_mask_init();
fpstate_xstate_init_size();
fpu__init_system_xstate();
fpu__init_system_ctx_switch();
fpu__init_cpu_ctx_switch();
}
@ -270,6 +279,4 @@ void fpu__detect(struct cpuinfo_x86 *c)
clear_cpu_cap(c, X86_FEATURE_FPU);
/* The final cr0 value is set later, in fpu_init() */
fpstate_xstate_init_size();
}