From cced767ad643931a29220b98a76282f4e253950d Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 29 Feb 2000 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2000-02-29

---
 port/alloc.c   | 1 -
 port/segment.c | 6 ++++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/port/alloc.c b/port/alloc.c
index c2dede5456964cd8c03a8b4649754ff26011a334..fd35e828895e19e79a1c95755f428e05ca390176 100644
--- a/port/alloc.c
+++ b/port/alloc.c
@@ -64,7 +64,6 @@ static void
 poolprint(Pool *p, char *fmt, ...)
 {
 	va_list v;
-	int n;
 	Private *pv;
 
 	pv = p->private;
diff --git a/port/segment.c b/port/segment.c
index 74fc66c4fe2b53e5695ceb89f9121a739d030517..23e0d25d888646a2e718f2ada7f17b284ec5a230 100644
--- a/port/segment.c
+++ b/port/segment.c
@@ -364,6 +364,12 @@ imagechanreclaim(void)
 	if(!canqlock(&imagealloc.fcreclaim))
 		return;
 
+	/*
+	 * We don't have to recheck that nfreechan > 0 after we
+	 * acquire the lock, because we're the only ones who decrement 
+	 * it (the other lock contender increments it), and there's only
+	 * one of us thanks to the qlock above.
+	 */
 	while(imagealloc.nfreechan > 0){
 		lock(&imagealloc);
 		imagealloc.nfreechan--;