diff options
| -rw-r--r-- | arch/x86/include/asm/i387.h | 44 | ||||
| -rw-r--r-- | arch/x86/include/asm/processor.h | 1 | ||||
| -rw-r--r-- | arch/x86/include/asm/thread_info.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/traps.c | 11 | ||||
| -rw-r--r-- | arch/x86/kernel/xsave.c | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/vmx.c | 2 |
6 files changed, 30 insertions, 32 deletions
diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h index 01b115d86770..f5376676f89c 100644 --- a/arch/x86/include/asm/i387.h +++ b/arch/x86/include/asm/i387.h @@ -264,21 +264,21 @@ static inline int restore_fpu_checking(struct task_struct *tsk) * be preemption protection *and* they need to be * properly paired with the CR0.TS changes! */ -static inline int __thread_has_fpu(struct thread_info *ti) +static inline int __thread_has_fpu(struct task_struct *tsk) { - return ti->status & TS_USEDFPU; + return tsk->thread.has_fpu; } /* Must be paired with an 'stts' after! */ -static inline void __thread_clear_has_fpu(struct thread_info *ti) +static inline void __thread_clear_has_fpu(struct task_struct *tsk) { - ti->status &= ~TS_USEDFPU; + tsk->thread.has_fpu = 0; } /* Must be paired with a 'clts' before! */ -static inline void __thread_set_has_fpu(struct thread_info *ti) +static inline void __thread_set_has_fpu(struct task_struct *tsk) { - ti->status |= TS_USEDFPU; + tsk->thread.has_fpu = 1; } /* @@ -288,16 +288,16 @@ static inline void __thread_set_has_fpu(struct thread_info *ti) * These generally need preemption protection to work, * do try to avoid using these on their own. */ -static inline void __thread_fpu_end(struct thread_info *ti) +static inline void __thread_fpu_end(struct task_struct *tsk) { - __thread_clear_has_fpu(ti); + __thread_clear_has_fpu(tsk); stts(); } -static inline void __thread_fpu_begin(struct thread_info *ti) +static inline void __thread_fpu_begin(struct task_struct *tsk) { clts(); - __thread_set_has_fpu(ti); + __thread_set_has_fpu(tsk); } /* @@ -308,21 +308,21 @@ extern int restore_i387_xstate(void __user *buf); static inline void __unlazy_fpu(struct task_struct *tsk) { - if (__thread_has_fpu(task_thread_info(tsk))) { + if (__thread_has_fpu(tsk)) { __save_init_fpu(tsk); - __thread_fpu_end(task_thread_info(tsk)); + __thread_fpu_end(tsk); } else tsk->fpu_counter = 0; } static inline void __clear_fpu(struct task_struct *tsk) { - if (__thread_has_fpu(task_thread_info(tsk))) { + if (__thread_has_fpu(tsk)) { /* Ignore delayed exceptions from user space */ asm volatile("1: fwait\n" "2:\n" _ASM_EXTABLE(1b, 2b)); - __thread_fpu_end(task_thread_info(tsk)); + __thread_fpu_end(tsk); } } @@ -337,7 +337,7 @@ static inline void __clear_fpu(struct task_struct *tsk) */ static inline bool interrupted_kernel_fpu_idle(void) { - return !__thread_has_fpu(current_thread_info()) && + return !__thread_has_fpu(current) && (read_cr0() & X86_CR0_TS); } @@ -371,12 +371,12 @@ static inline bool irq_fpu_usable(void) static inline void kernel_fpu_begin(void) { - struct thread_info *me = current_thread_info(); + struct task_struct *me = current; WARN_ON_ONCE(!irq_fpu_usable()); preempt_disable(); if (__thread_has_fpu(me)) { - __save_init_fpu(me->task); + __save_init_fpu(me); __thread_clear_has_fpu(me); /* We do 'stts()' in kernel_fpu_end() */ } else @@ -441,13 +441,13 @@ static inline void irq_ts_restore(int TS_state) */ static inline int user_has_fpu(void) { - return __thread_has_fpu(current_thread_info()); + return __thread_has_fpu(current); } static inline void user_fpu_end(void) { preempt_disable(); - __thread_fpu_end(current_thread_info()); + __thread_fpu_end(current); preempt_enable(); } @@ -455,7 +455,7 @@ static inline void user_fpu_begin(void) { preempt_disable(); if (!user_has_fpu()) - __thread_fpu_begin(current_thread_info()); + __thread_fpu_begin(current); preempt_enable(); } @@ -464,10 +464,10 @@ static inline void user_fpu_begin(void) */ static inline void save_init_fpu(struct task_struct *tsk) { - WARN_ON_ONCE(!__thread_has_fpu(task_thread_info(tsk))); + WARN_ON_ONCE(!__thread_has_fpu(tsk)); preempt_disable(); __save_init_fpu(tsk); - __thread_fpu_end(task_thread_info(tsk)); + __thread_fpu_end(tsk); preempt_enable(); } diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index b650435ffb53..bb3ee3629a0f 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -456,6 +456,7 @@ struct thread_struct { unsigned long trap_no; unsigned long error_code; /* floating point and extended processor state */ + unsigned long has_fpu; struct fpu fpu; #ifdef CONFIG_X86_32 /* Virtual 86 mode info */ diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index a1fe5c127b52..d7ef849714a1 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -242,8 +242,6 @@ static inline struct thread_info *current_thread_info(void) * ever touches our thread-synchronous status, so we don't * have to worry about atomic accesses. */ -#define TS_USEDFPU 0x0001 /* FPU was used by this task - this quantum (SMP) */ #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ #define TS_POLLING 0x0004 /* idle task polling need_resched, skip sending interrupt */ diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index c24bb75c6d0f..a99badf2fe81 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -573,12 +573,11 @@ asmlinkage void __attribute__((weak)) smp_threshold_interrupt(void) */ void math_state_restore(void) { - struct thread_info *thread = current_thread_info(); - struct task_struct *tsk = thread->task; + struct task_struct *tsk = current; /* We need a safe address that is cheap to find and that is already - in L1. We just brought in "thread->task", so use that */ -#define safe_address (thread->task) + in L1. We're just bringing in "tsk->thread.has_fpu", so use that */ +#define safe_address (tsk->thread.has_fpu) if (!tsk_used_math(tsk)) { local_irq_enable(); @@ -595,7 +594,7 @@ void math_state_restore(void) local_irq_disable(); } - __thread_fpu_begin(thread); + __thread_fpu_begin(tsk); /* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception is pending. Clear the x87 state here by setting it to fixed @@ -611,7 +610,7 @@ void math_state_restore(void) * Paranoid restore. send a SIGSEGV if we fail to restore the state. */ if (unlikely(restore_fpu_checking(tsk))) { - __thread_fpu_end(thread); + __thread_fpu_end(tsk); force_sig(SIGSEGV, tsk); return; } diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c index a0bcd0dbc951..711091114119 100644 --- a/arch/x86/kernel/xsave.c +++ b/arch/x86/kernel/xsave.c @@ -47,7 +47,7 @@ void __sanitize_i387_state(struct task_struct *tsk) if (!fx) return; - BUG_ON(__thread_has_fpu(task_thread_info(tsk))); + BUG_ON(__thread_has_fpu(tsk)); xstate_bv = tsk->thread.fpu.state->xsave.xsave_hdr.xstate_bv; diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index b2c612d5db0b..4ea76784fe65 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1456,7 +1456,7 @@ static void __vmx_load_host_state(struct vcpu_vmx *vmx) #ifdef CONFIG_X86_64 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); #endif - if (__thread_has_fpu(current_thread_info())) + if (__thread_has_fpu(current)) clts(); load_gdt(&__get_cpu_var(host_gdt)); } |