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x86/fpu: Move 'PER_CPU(fpu_owner_task)' to fpu/core.c 

Move it closer to other per-cpu FPU data structures.

This also unifies the 32-bit and 64-bit code.

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>
hifive-unleashed-5.1
Ingo Molnar 2015-04-23 12:13:04 +02:00
parent 36fe6175be
commit b0c050c5ba
2 changed files with 5 additions and 3 deletions
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3
arch/x86/kernel/cpu/common.c
View File

@ -1182,8 +1182,6 @@ DEFINE_PER_CPU(unsigned int, irq_count) __visible = -1;
DEFINE_PER_CPU(int, __preempt_count) = INIT_PREEMPT_COUNT;
EXPORT_PER_CPU_SYMBOL(__preempt_count);
DEFINE_PER_CPU(struct task_struct *, fpu_owner_task);
/*
* Special IST stacks which the CPU switches to when it calls
* an IST-marked descriptor entry. Up to 7 stacks (hardware
@ -1274,7 +1272,6 @@ DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task;
EXPORT_PER_CPU_SYMBOL(current_task);
DEFINE_PER_CPU(int, __preempt_count) = INIT_PREEMPT_COUNT;
EXPORT_PER_CPU_SYMBOL(__preempt_count);
DEFINE_PER_CPU(struct task_struct *, fpu_owner_task);
/*
* On x86_32, vm86 modifies tss.sp0, so sp0 isn't a reliable way to find

5
arch/x86/kernel/fpu/core.c
View File

@ -20,6 +20,11 @@
*/
static DEFINE_PER_CPU(bool, in_kernel_fpu);
/*
* Track which task is using the FPU on the CPU:
*/
DEFINE_PER_CPU(struct task_struct *, fpu_owner_task);
static void kernel_fpu_disable(void)
{
WARN_ON(this_cpu_read(in_kernel_fpu));