linux-kernel - [PATCH 5/8] sched: clarify commment for TS

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Message-id: <e45b7fa23097332508730123ac6d59227e7bd7f8.1275026041.git.len.brown@intel.com>
Date:	Fri, 28 May 2010 02:01:58 -0400
From:	Len Brown <lenb@...nel.org>
To:	linux-pm@...ts.linux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>
Subject: [PATCH 5/8] sched: clarify commment for TS_POLLING

From: Len Brown <len.brown@...el.com>

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@....com>
Signed-off-by: Len Brown <len.brown@...el.com>
Acked-by: Peter Zijlstra <peterz@...radead.org>
---
 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..8121869 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	/* 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 */
 
-- 
1.6.0.6

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