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Commit 2a705ad6 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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sched/idle, alpha: 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>
Acked-by: default avatarRichard Henderson <rth@twiddle.net>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: 蔡正龙 <zhenglong.cai@cs2c.com.cn>
Cc: linux-alpha@vger.kernel.org
Link: http://lkml.kernel.org/n/tip-9tfzr196gs0n2afxv0ga8pc3@git.kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 39a4d9ca

arch/alpha/include/asm/thread_info.h

+2 −2
Original line number Diff line number Diff line
@@ -73,12 +73,14 @@ register struct thread_info *__current_thread_info __asm__("$8"); 
#define TIF_SYSCALL_AUDIT	4	/* syscall audit active */

#define TIF_DIE_IF_KERNEL	9	/* dik recursion lock */

#define TIF_MEMDIE		13	/* is terminating due to OOM killer */

#define TIF_POLLING_NRFLAG	14	/* idle is polling for TIF_NEED_RESCHED */



#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)

#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)

#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)

#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)



/* Work to do on interrupt/exception return.  */

#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
@@ -92,8 +94,6 @@ register struct thread_info *__current_thread_info __asm__("$8"); 
#define TS_UAC_NOFIX		0x0002	/* ! flags as they match          */

#define TS_UAC_SIGBUS		0x0004	/* ! userspace part of 'osf_sysinfo' */

#define TS_RESTORE_SIGMASK	0x0008	/* restore signal mask in do_signal() */

#define TS_POLLING		0x0010	/* idle task polling need_resched,

					   skip sending interrupt */



#ifndef __ASSEMBLY__

#define HAVE_SET_RESTORE_SIGMASK	1