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x86/fpu: Propagate once per boot quirk into fpu__init_system_xstate() 

Linearize the call sequence in xsave_init():

	fpu__init_system_xstate();
	fpu__init_cpu_xstate();

We do this by propagating the boot-once quirk into
fpu__init_system_xstate(). fpu__init_cpu_xstate() is
safe to be called multiple time.

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 2015-04-25 06:50:09 +02:00
parent e9dbfd673a
commit 62db6871ae
1 changed files with 7 additions and 8 deletions
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15
arch/x86/kernel/fpu/xsave.c
View File

@ -652,6 +652,11 @@ static void __init init_xstate_size(void)
void fpu__init_system_xstate(void) void fpu__init_system_xstate(void)
{ {
unsigned int eax, ebx, ecx, edx; unsigned int eax, ebx, ecx, edx;
static bool on_boot_cpu = 1;
if (!on_boot_cpu)
return;
on_boot_cpu = 0;
if (!cpu_has_xsave) { if (!cpu_has_xsave) {
pr_info("x86/fpu: Legacy x87 FPU detected.\n"); pr_info("x86/fpu: Legacy x87 FPU detected.\n");
@ -714,14 +719,8 @@ void fpu__init_system_xstate(void)
*/ */
void xsave_init(void) void xsave_init(void)
{ {
static char on_boot_cpu = 1; fpu__init_system_xstate();
fpu__init_cpu_xstate();
if (on_boot_cpu) {
on_boot_cpu = 0;
fpu__init_system_xstate();
} else {
fpu__init_cpu_xstate();
}
} }
/* /*