From a2de789ebb804374bac13ef2931158c364c2774a Mon Sep 17 00:00:00 2001
From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Thu, 2 Jul 2020 12:58:07 +0000
Subject: [PATCH] cred: add a prediction to crfree for td->td_realucred == cr

This matches crhold and eliminates an assembly maze in the common case.
---
 sys/kern/kern_prot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/kern_prot.c b/sys/kern/kern_prot.c
index 8057749c0ce6..3dbf3e19acbe 100644
--- a/sys/kern/kern_prot.c
+++ b/sys/kern/kern_prot.c
@@ -1985,7 +1985,7 @@ crfree(struct ucred *cr)
 	struct thread *td;
 
 	td = curthread;
-	if (td->td_realucred == cr) {
+	if (__predict_true(td->td_realucred == cr)) {
 		KASSERT(cr->cr_users > 0, ("%s: users %d not > 0 on cred %p",
 		    __func__, cr->cr_users, cr));
 		td->td_ucredref--;