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Subject[PATCH 5/8] sched: clarify commment for TS_POLLING
From: Len Brown <>

TS_POLLING set tells the scheduler a task will poll
need_resched() to look for work.

TS_POLLING clear tells resched_task() and wake_up_idle_cpu()
that the remote CPU is sleeping in idle, and thus requires
a reschedule interrupt to wake them to notice work.

Update the description of TS_POLLING to reflect how it works.
"cleared when sleeping in idle, requiring reschedule interrupt"

Signed-off-by: Len Brown <>
Acked-by: Peter Zijlstra <>
arch/x86/include/asm/thread_info.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index e0d2890..0a14da2 100644
--- 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 /* clear when sleeping in idle
+ requiring reschedule interrupt */
#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */
#define TS_XSAVE 0x0010 /* Use xsave/xrstor */


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