linux-kernel - [patch 1/6 -rt] powerpc 2.6.20-rt8: add preemption checks for NEED_RESCHED

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Message-ID: <yyi7itt25t5.wl@toshiba.co.jp>
Date:	Wed, 07 Mar 2007 10:36:21 +0900
From:	Tsutomu OWA <tsutomu.owa@...hiba.co.jp>
To:	mingo@...e.hu
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	tsutomu.owa@...hiba.co.jp
Subject: [patch 1/6 -rt] powerpc 2.6.20-rt8: add preemption checks for NEED_RESCHED_DELAYED.


  To add preemption checks for the NEED_RESCHED_DELAYED flag.

Signed-off-by: Tsutomu Owa <tsutomu.owa@...hiba.co.jp>
-- owa

diff -rup linux-rt8/include/asm-powerpc/thread_info.h rt/include/asm-powerpc/thread_info.h
--- linux-rt8/include/asm-powerpc/thread_info.h	2007-02-20 14:30:40.000000000 +0900
+++ rt/include/asm-powerpc/thread_info.h	2007-02-20 15:39:25.000000000 +0900
@@ -146,7 +146,8 @@ static inline struct thread_info *curren
 #define _TIF_SYSCALL_T_OR_A	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
 
 #define _TIF_USER_WORK_MASK	(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
-				 _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)
+				 _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK | \
+				 _TIF_NEED_RESCHED_DELAYED)
 #define _TIF_PERSYSCALL_MASK	(_TIF_RESTOREALL|_TIF_NOERROR)
 
 /* Bits in local_flags */
diff -rup linux-rt8/arch/powerpc/kernel/entry_64.S rt/arch/powerpc/kernel/entry_64.S
--- linux-rt8/arch/powerpc/kernel/entry_64.S	2007-02-20 09:38:52.000000000 +0900
+++ rt/arch/powerpc/kernel/entry_64.S	2007-03-05 11:59:17.000000000 +0900
@@ -444,7 +444,8 @@ _GLOBAL(ret_from_except_lite)
 
 #ifdef CONFIG_PREEMPT
 	clrrdi	r9,r1,THREAD_SHIFT	/* current_thread_info() */
-	li	r0,_TIF_NEED_RESCHED	/* bits to check */
+	li	r0,(_TIF_NEED_RESCHED|_TIF_NEED_RESCHED_DELAYED)
+					/* bits to check */
 	ld	r3,_MSR(r1)
 	ld	r4,TI_FLAGS(r9)
 	/* Move MSR_PR bit in r3 to _TIF_SIGPENDING position in r0 */
@@ -565,7 +566,7 @@ do_work:
 	rotldi	r10,r10,16
 	mtmsrd	r10,1
 	ld	r4,TI_FLAGS(r9)
-	andi.	r0,r4,_TIF_NEED_RESCHED
+	andi.	r0,r4,(_TIF_NEED_RESCHED|_TIF_NEED_RESCHED_DELAYED)
 	bne	1b
 	b	restore
 
@@ -575,7 +576,7 @@ user_work:
 	ori	r10,r10,MSR_EE
 	mtmsrd	r10,1
 
-	andi.	r0,r4,_TIF_NEED_RESCHED
+	andi.	r0,r4,(_TIF_NEED_RESCHED|_TIF_NEED_RESCHED_DELAYED)
 	beq	1f
 	bl	.schedule
 	b	.ret_from_except_lite
diff -rup linux-rt8/arch/powerpc/kernel/idle.c rt/arch/powerpc/kernel/idle.c
--- linux-rt8/arch/powerpc/kernel/idle.c	2007-02-20 14:30:38.000000000 +0900
+++ rt/arch/powerpc/kernel/idle.c	2007-02-20 15:43:04.000000000 +0900
@@ -56,7 +56,8 @@ void cpu_idle(void)
 
 	set_thread_flag(TIF_POLLING_NRFLAG);
 	while (1) {
-		while (!need_resched() && !cpu_should_die()) {
+		while (!need_resched() && !need_resched_delayed() &&
+				!cpu_should_die()) {
 			ppc64_runlatch_off();
 
 			if (ppc_md.power_save) {

-
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