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SubjectRe: [RFC][PATCH 6/8] sched,idle: Avoid spurious wakeup IPIs
On Fri, May 09, 2014 at 07:02:34PM +0200, Peter Zijlstra wrote:
> OK, so I'll queue a patch removing TIF_POLLING_NRFLAG for arm64.


---
Subject: arm64: Remove TIF_POLLING_NRFLAG
From: Peter Zijlstra <peterz@infradead.org>
Date: Fri May 9 19:04:00 CEST 2014

The only idle method for arm64 is WFI and it therefore
unconditionally requires the reschedule interrupt when idle.

Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
---
arch/arm64/include/asm/thread_info.h | 2 --
1 file changed, 2 deletions(-)

--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -95,13 +95,11 @@ static inline struct thread_info *curren
* TIF_NEED_RESCHED - rescheduling necessary
* TIF_NOTIFY_RESUME - callback before returning to user
* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
- * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
*/
#define TIF_SIGPENDING 0
#define TIF_NEED_RESCHED 1
#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
#define TIF_SYSCALL_TRACE 8
-#define TIF_POLLING_NRFLAG 16
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
#define TIF_FREEZE 19
#define TIF_RESTORE_SIGMASK 20[unhandled content-type:application/pgp-signature]
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