[SPARC]: Fix TIF_USEDFPU flag atomicity

From: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/process.c

@@ -348,7 +348,7 @@ void exit_thread(void)
 #ifndef CONFIG_SMP
 	if(last_task_used_math == current) {
 #else
-	if(current_thread_info()->flags & _TIF_USEDFPU) {
+	if (test_thread_flag(TIF_USEDFPU)) {
 #endif
 		/* Keep process from leaving FPU in a bogon state. */
 		put_psr(get_psr() | PSR_EF);
@@ -357,7 +357,7 @@ void exit_thread(void)
 #ifndef CONFIG_SMP
 		last_task_used_math = NULL;
 #else
-		current_thread_info()->flags &= ~_TIF_USEDFPU;
+		clear_thread_flag(TIF_USEDFPU);
 #endif
 	}
 }
@@ -371,7 +371,7 @@ void flush_thread(void)
 #ifndef CONFIG_SMP
 	if(last_task_used_math == current) {
 #else
-	if(current_thread_info()->flags & _TIF_USEDFPU) {
+	if (test_thread_flag(TIF_USEDFPU)) {
 #endif
 		/* Clean the fpu. */
 		put_psr(get_psr() | PSR_EF);
@@ -380,7 +380,7 @@ void flush_thread(void)
 #ifndef CONFIG_SMP
 		last_task_used_math = NULL;
 #else
-		current_thread_info()->flags &= ~_TIF_USEDFPU;
+		clear_thread_flag(TIF_USEDFPU);
 #endif
 	}
 
@@ -466,13 +466,13 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
 #ifndef CONFIG_SMP
 	if(last_task_used_math == current) {
 #else
-	if(current_thread_info()->flags & _TIF_USEDFPU) {
+	if (test_thread_flag(TIF_USEDFPU)) {
 #endif
 		put_psr(get_psr() | PSR_EF);
 		fpsave(&p->thread.float_regs[0], &p->thread.fsr,
 		       &p->thread.fpqueue[0], &p->thread.fpqdepth);
 #ifdef CONFIG_SMP
-		current_thread_info()->flags &= ~_TIF_USEDFPU;
+		clear_thread_flag(TIF_USEDFPU);
 #endif
 	}
 
@@ -609,13 +609,13 @@ int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
 		return 1;
 	}
 #ifdef CONFIG_SMP
-	if (current_thread_info()->flags & _TIF_USEDFPU) {
+	if (test_thread_flag(TIF_USEDFPU)) {
 		put_psr(get_psr() | PSR_EF);
 		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
 		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
 		if (regs != NULL) {
 			regs->psr &= ~(PSR_EF);
-			current_thread_info()->flags &= ~(_TIF_USEDFPU);
+			clear_thread_flag(TIF_USEDFPU);
 		}
 	}
 #else

arch/sparc/kernel/traps.c

@@ -259,7 +259,7 @@ void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
 	} else {
 		fpload(&current->thread.float_regs[0], &current->thread.fsr);
 	}
-	current_thread_info()->flags |= _TIF_USEDFPU;
+	set_thread_flag(TIF_USEDFPU);
 #endif
 }
 
@@ -290,7 +290,7 @@ void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
 #ifndef CONFIG_SMP
 	if(!fpt) {
 #else
-        if(!(task_thread_info(fpt)->flags & _TIF_USEDFPU)) {
+	if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
 #endif
 		fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
 		regs->psr &= ~PSR_EF;
@@ -333,7 +333,7 @@ void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
 	/* nope, better SIGFPE the offending process... */
 	       
 #ifdef CONFIG_SMP
-	task_thread_info(fpt)->flags &= ~_TIF_USEDFPU;
+	clear_tsk_thread_flag(fpt, TIF_USEDFPU);
 #endif
 	if(psr & PSR_PS) {
 		/* The first fsr store/load we tried trapped,