Re: [PATCH] x86-64: Fix the nterrupt race is in idle callback (2nd try)

[Venkatesh Pallipadi]

Here is the second try. Thanks to Suresh Siddha who pointed out a issue with
enabling interrupts in the first patch.


Idle callbacks has some races when enter_idle() sets isidle and subsequent
interrupts that can happen on that CPU, before CPU goes to idle. Due to this,
an IDLE_END can get called before IDLE_START. To avoid these races, disable
interrupts before enter_idle and make sure that all idle routines do not
enable interrupts before entering idle.

Note that poll_idle() still has a this race as it has to enable interrupts
before going to idle. But, all other idle routines have the race fixed.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>

Index: linux-2.6.19-rc-mm/arch/x86_64/kernel/process.c
===================================================================
--- linux-2.6.19-rc-mm.orig/arch/x86_64/kernel/process.c
+++ linux-2.6.19-rc-mm/arch/x86_64/kernel/process.c
@@ -127,6 +127,7 @@ static void default_idle(void)
  */
 static void poll_idle (void)
 {
+	local_irq_enable();
 	cpu_relax();
 }
 
@@ -206,6 +207,12 @@ void cpu_idle (void)
 				idle = default_idle;
 			if (cpu_is_offline(smp_processor_id()))
 				play_dead();
+			/*
+			 * Idle routines should keep interrupts disabled
+			 * from here on, until they go to idle.
+			 * Otherwise, idle callbacks can misfire.
+			 */
+			local_irq_disable();
 			enter_idle();
 			idle();
 			/* In many cases the interrupt that ended idle
@@ -237,14 +244,22 @@ void mwait_idle_with_hints(unsigned long
 		smp_mb();
 		if (!need_resched())
 			__mwait(eax, ecx);
+		else
+			local_irq_enable();
+	} else {
+		local_irq_enable();
 	}
 }
 
 /* Default MONITOR/MWAIT with no hints, used for default C1 state */
 static void mwait_idle(void)
 {
-	local_irq_enable();
-	mwait_idle_with_hints(0,0);
+	if (!need_resched()) {
+		__monitor((void *)&current_thread_info()->flags, 0, 0);
+		smp_mb();
+		if (!need_resched())
+			__sti_mwait(0, 0);
+	}
 }
 
 void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
Index: linux-2.6.19-rc-mm/include/asm-x86_64/processor.h
===================================================================
--- linux-2.6.19-rc-mm.orig/include/asm-x86_64/processor.h
+++ linux-2.6.19-rc-mm/include/asm-x86_64/processor.h
@@ -475,6 +475,14 @@ static inline void __mwait(unsigned long
 		: :"a" (eax), "c" (ecx));
 }
 
+static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
+{
+	/* "mwait %eax,%ecx;" */
+	asm volatile(
+		"sti; .byte 0x0f,0x01,0xc9;"
+		: :"a" (eax), "c" (ecx));
+}
+
 extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx);
 
 #define stack_current() \
-
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