From: Ingo Molnar <mingo@kernel.org> Date: Sat, 25 Apr 2015 04:50:09 +0000 (+0200) Subject: x86/fpu: Propagate once per boot quirk into fpu__init_system_xstate() X-Git-Tag: firefly_0821_release~176^2~1627^2~150 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=62db6871ae862fbd7f7abfebffe501b170698a8b;p=firefly-linux-kernel-4.4.55.git 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> --- diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c index fd656cbdd315..9d5ff90916b1 100644 --- a/arch/x86/kernel/fpu/xsave.c +++ b/arch/x86/kernel/fpu/xsave.c @@ -652,6 +652,11 @@ static void __init init_xstate_size(void) void fpu__init_system_xstate(void) { 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) { pr_info("x86/fpu: Legacy x87 FPU detected.\n"); @@ -714,14 +719,8 @@ void fpu__init_system_xstate(void) */ void xsave_init(void) { - static char on_boot_cpu = 1; - - if (on_boot_cpu) { - on_boot_cpu = 0; - fpu__init_system_xstate(); - } else { - fpu__init_cpu_xstate(); - } + fpu__init_system_xstate(); + fpu__init_cpu_xstate(); } /*