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| author | Ingo Molnar <mingo@kernel.org> | 2015-04-25 06:50:09 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 15:47:40 +0200 |
| commit | 62db6871ae862fbd7f7abfebffe501b170698a8b (patch) | |
| tree | 9d4aeeed478e67f0343aa781a5ba3d66ad4f8efc /arch | |
| parent | e9dbfd673a9cc9d3ef90e3ea4e136a833dab3674 (diff) | |
| download | linux-62db6871ae862fbd7f7abfebffe501b170698a8b.tar.bz2 | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/fpu/xsave.c | 15 |
1 files changed, 7 insertions, 8 deletions
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(); } /* |