---

yaml --- r: 287656 b: refs/heads/master c: f94edac h: refs/heads/master v: v3
git-mirror · Feb 18, 2012 · 007b60e · 007b60e
1 parent bdab093
commit 007b60e
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Showing 7 changed files with 31 additions and 33 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4903062b5485f0e2c286a23b44c9b59d9b017d53
+refs/heads/master: f94edacf998516ac9d849f7bc6949a703977a7f3
diff --git a/trunk/arch/x86/include/asm/i387.h b/trunk/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
@@ -441,21 +441,21 @@ 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();
 }
 
 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/trunk/arch/x86/include/asm/processor.h b/trunk/arch/x86/include/asm/processor.h
@@ -454,6 +454,7 @@ 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/trunk/arch/x86/include/asm/thread_info.h b/trunk/arch/x86/include/asm/thread_info.h
@@ -247,8 +247,6 @@ 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/trunk/arch/x86/kernel/traps.c b/trunk/arch/x86/kernel/traps.c
@@ -582,12 +582,11 @@ 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();
@@ -604,7 +603,7 @@ 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
@@ -620,7 +619,7 @@ 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/trunk/arch/x86/kernel/xsave.c b/trunk/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/trunk/arch/x86/kvm/vmx.c b/trunk/arch/x86/kvm/vmx.c
@@ -1457,7 +1457,7 @@ 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));
 }