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Commit 04075425 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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sched/idle, ia64: Switch from TS_POLLING to TIF_POLLING_NRFLAG 



Standardize the idle polling indicator to TIF_POLLING_NRFLAG such that
both TIF_NEED_RESCHED and TIF_POLLING_NRFLAG are in the same word.
This will allow us, using fetch_or(), to both set NEED_RESCHED and
check for POLLING_NRFLAG in a single operation and avoid pointless
wakeups.

Changing from the non-atomic thread_info::status flags to the atomic
thread_info::flags shouldn't be a big issue since most polling state
changes were followed/preceded by a full memory barrier anyway.

Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: linux-ia64@vger.kernel.org
Link: http://lkml.kernel.org/n/tip-6633akuird5hi3si4gbegkm8@git.kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent b3a8cb18

arch/ia64/include/asm/thread_info.h

+2 −1
Original line number Diff line number Diff line
@@ -107,6 +107,7 @@ struct thread_info { 
#define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */

#define TIF_DB_DISABLED		19	/* debug trap disabled for fsyscall */

#define TIF_RESTORE_RSE		21	/* user RBS is newer than kernel RBS */

#define TIF_POLLING_NRFLAG	22	/* idle is polling for TIF_NEED_RESCHED */



#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)

#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
@@ -118,6 +119,7 @@ struct thread_info { 
#define _TIF_MCA_INIT		(1 << TIF_MCA_INIT)

#define _TIF_DB_DISABLED	(1 << TIF_DB_DISABLED)

#define _TIF_RESTORE_RSE	(1 << TIF_RESTORE_RSE)

#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)



/* "work to do on user-return" bits */

#define TIF_ALLWORK_MASK	(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
@@ -125,7 +127,6 @@ struct thread_info { 
/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */

#define TIF_WORK_MASK		(TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))



#define TS_POLLING		1 	/* true if in idle loop and not sleeping */

#define TS_RESTORE_SIGMASK	2	/* restore signal mask in do_signal() */



#ifndef __ASSEMBLY__