[MIPS] Make sure cpu_has_fpu is used only in atomic context

Make sure cpu_has_fpu (which uses smp_processor_id()) is used only in
atomic context.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/ptrace32.c

@@ -175,7 +175,9 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
 			unsigned int mtflags;
 #endif /* CONFIG_MIPS_MT_SMTC */
 
+			preempt_disable();
 			if (!cpu_has_fpu) {
+				preempt_enable();
 				tmp = 0;
 				break;
 			}
@@ -186,7 +188,6 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
 			mtflags = dmt();
 #endif /* CONFIG_MIPS_MT_SMTC */
 
-			preempt_disable();
 			if (cpu_has_mipsmt) {
 				unsigned int vpflags = dvpe();
 				flags = read_c0_status();