- Close races with signals and other AST's being triggered while we are in

  the process of exiting the kernel.  The ast() function now loops as long
  as the PS_ASTPENDING or PS_NEEDRESCHED flags are set.  It returns with
  preemption disabled so that any further AST's that arrive via an
  interrupt will be delayed until the low-level MD code returns to user
  mode.
- Use u_int's to store the tick counts for profiling purposes so that we
  do not need sched_lock just to read p_sticks.  This also closes a
  problem where the call to addupc_task() could screw up the arithmetic
  due to non-atomic reads of p_sticks.
- Axe need_proftick(), aston(), astoff(), astpending(), need_resched(),
  clear_resched(), and resched_wanted() in favor of direct bit operations
  on p_sflag.
- Fix up locking with sched_lock some.  In addupc_intr(), use sched_lock
  to ensure pr_addr and pr_ticks are updated atomically with setting
  PS_OWEUPC.  In ast() we clear pr_ticks atomically with clearing
  PS_OWEUPC.  We also do not grab the lock just to test a flag.
- Simplify the handling of Giant in ast() slightly.

Reviewed by:	bde (mostly)

3 files changed, 2 insertions, 4 deletions

diff --git a/sys/powerpc/aim/trap.c b/sys/powerpc/aim/trap.c
index 213fe29..43c754f 100644
--- a/sys/powerpc/aim/trap.c
+++ b/sys/powerpc/aim/trap.c
@@ -76,7 +76,7 @@ trap(struct trapframe *frame)
 #if 0 /* XXX: This code hasn't been reworked yet. */
 	struct proc *p;
 	int type;
-	u_quad_t sticks;
+	u_int sticks;
 
 	p = curproc;
 	type = frame->exc;
diff --git a/sys/powerpc/include/cpu.h b/sys/powerpc/include/cpu.h
index 0a541a2..37ca02b 100644
--- a/sys/powerpc/include/cpu.h
+++ b/sys/powerpc/include/cpu.h
@@ -56,8 +56,6 @@ extern void delay __P((unsigned));
 extern int want_resched;
 extern int astpending;
 
-#define	need_proftick(p)	((p)->p_flag |= PS_OWEUPC, astpending = 1)
-
 extern char bootpath[];
 
 #if defined(_KERNEL) || defined(_STANDALONE)
diff --git a/sys/powerpc/powerpc/trap.c b/sys/powerpc/powerpc/trap.c
index 213fe29..43c754f 100644
--- a/sys/powerpc/powerpc/trap.c
+++ b/sys/powerpc/powerpc/trap.c
@@ -76,7 +76,7 @@ trap(struct trapframe *frame)
 #if 0 /* XXX: This code hasn't been reworked yet. */
 	struct proc *p;
 	int type;
-	u_quad_t sticks;
+	u_int sticks;
 
 	p = curproc;
 	type = frame->exc;