sched: clarify commment for TS_POLLING

TS_POLLING set tells the scheduler an idle_task will poll
need_resched() to look for work.

TS_POLLING clear tells resched_task() and wake_up_idle_cpu()
that the remote CPU's idle_task is now sleeping in idle,
and thus requires a reschedule interrupt notice work.

Update the description of TS_POLLING to reflect how it works.
"idle task polling need_resched, skip sending interrupt"

Wordsmithing-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>

diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index e0d28901e9691ee53fcd57edf0fa08a6cd5ce8c2..812186919bba55fbf328bb1bd64cfe82b26988a9 100644 (file)
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -241,8 +241,8 @@ static inline struct thread_info *current_thread_info(void)
 #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  /* true if in idle loop
-                                          and not sleeping */
+#define TS_POLLING             0x0004  /* idle task polling need_resched,
+                                          skip sending interrupt */
 #define TS_RESTORE_SIGMASK     0x0008  /* restore signal mask in do_signal() */
 #define TS_XSAVE               0x0010  /* Use xsave/xrstor */