swap: fix a nasty little bug

We checked against the wrong process for one case, that in turn meant a specific
pattern of activity could mess up when it tried to swap out a zombie process

diff --git a/Kernel/swap.c b/Kernel/swap.c
index c2c269c..7e19b60 100644 (file)
--- a/Kernel/swap.c
+++ b/Kernel/swap.c
@@ -104,7 +104,7 @@ static ptptr swapvictim(ptptr p, int notself)
                        if (c->p_status == P_READY)
                                r = c;
                        if (c->p_status > P_READY
-                           && p->p_status <= P_FORKING) {
+                           && c->p_status <= P_FORKING) {
                                /* relative position in order of waits, bigger is longer, can wrap but
                                   shouldn't really matter to us much if it does */
                                s = (waitno - c->p_waitno);