commit 8557cf226032d0ac1d751896c7d7fefdc10de8bc
Author: Corcodel Marian <asd@marian1000.go.ro>
Date:   Sun Jul 3 11:31:12 2016 +0300

     Prevent run mwait_idle_with_hints funct on resched process.
    
     Is not good ideea to run mwait_idle_with_hints when resched
     is running.Most of embedded functions check for non existence of
     rescheduling process.

diff --git a/arch/x86/include/asm/mwait.h b/arch/x86/include/asm/mwait.h
index 0deeb2d..d8d0633 100644
--- a/arch/x86/include/asm/mwait.h
+++ b/arch/x86/include/asm/mwait.h
@@ -97,6 +97,9 @@ static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
  */
 static inline void mwait_idle_with_hints(unsigned long eax, unsigned long ecx)
 {
+	if (need_resched()) {
+		return;
+	}
 	if (!current_set_polling_and_test()) {
 		if (static_cpu_has_bug(X86_BUG_CLFLUSH_MONITOR)) {
 			mb();
@@ -105,8 +108,7 @@ static inline void mwait_idle_with_hints(unsigned long eax, unsigned long ecx)
 		}
 
 		__monitor((void *)&current_thread_info()->flags, 0, 0);
-		if (!need_resched())
-			__mwait(eax, ecx);
+		__mwait(eax, ecx);
 	}
 	current_clr_polling();
 }