From 651c378316119ce7911952aa0b17d41455352653 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 15 Nov 2000 21:56:50 +0000
Subject: [PATCH] - Don't acquire/release Giant during an interrupt context for
 machine   checks, clock interrupts, and device interrupts. - Assert that
 Giant is not owned during the main loop of ithd_loop().

---
 sys/alpha/alpha/interrupt.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/sys/alpha/alpha/interrupt.c b/sys/alpha/alpha/interrupt.c
index a95564aa70c7..4d3ddc948c62 100644
--- a/sys/alpha/alpha/interrupt.c
+++ b/sys/alpha/alpha/interrupt.c
@@ -99,7 +99,6 @@ interrupt(a0, a1, a2, framep)
 		struct proc *p = curproc;
 		if (!p) p = &proc0;
 		if ((caddr_t) framep < (caddr_t) p->p_addr + 1024) {
-			mtx_enter(&Giant, MTX_DEF);
 			panic("possible stack overflow\n");
 		}
 	}
@@ -121,33 +120,25 @@ interrupt(a0, a1, a2, framep)
 			return;
 		}
 			
-		mtx_enter(&Giant, MTX_DEF);
 		alpha_clock_interrupt(framep);
-		mtx_exit(&Giant, MTX_DEF);
 		break;
 
 	case  ALPHA_INTR_ERROR:	/* Machine Check or Correctable Error */
-		mtx_enter(&Giant, MTX_DEF);
 		a0 = alpha_pal_rdmces();
 		if (platform.mcheck_handler)
 			(*platform.mcheck_handler)(a0, framep, a1, a2);
 		else
 			machine_check(a0, framep, a1, a2);
-		mtx_exit(&Giant, MTX_DEF);
 		break;
 
 	case ALPHA_INTR_DEVICE:	/* I/O device interrupt */
-		mtx_enter(&Giant, MTX_DEF);
 		cnt.v_intr++;
 		if (platform.iointr)
 			(*platform.iointr)(framep, a1);
-		mtx_exit(&Giant, MTX_DEF);
 		break;
 
 	case ALPHA_INTR_PERF:	/* interprocessor interrupt */
-		mtx_enter(&Giant, MTX_DEF);
 		perf_irq(a1, framep);
-		mtx_exit(&Giant, MTX_DEF);
 		break;
 
 	case ALPHA_INTR_PASSIVE:
@@ -157,7 +148,6 @@ interrupt(a0, a1, a2, framep)
 		break;
 
 	default:
-		mtx_enter(&Giant, MTX_DEF);
 		panic("unexpected interrupt: type 0x%lx vec 0x%lx a2 0x%lx\n",
 		    a0, a1, a2);
 		/* NOTREACHED */
@@ -638,6 +628,7 @@ ithd_loop(void *dummy)
 		 * lock.  This may take a while and it_need may get
 		 * set again, so we have to check it again.
 		 */
+		mtx_assert(&Giant, MA_NOTOWNED);
 		mtx_enter(&sched_lock, MTX_SPIN);
 		if (!ithd->it_need) {
 			ithd->it_proc->p_stat = SWAIT; /* we're idle */