From 85a76f5fc9792cafa1a54c12ef38c049c41ec5ef Mon Sep 17 00:00:00 2001
From: Matthew Dillon <dillon@apollo.backplane.com>
Date: Wed, 6 Dec 2017 00:23:16 -0800
Subject: [PATCH] kernel - Fix vmstats.v_dma_pages

* Fix an atomic adjustment on v_dma_pages that we believe was
  messing it up, due to not sign-extended a negation of an unsigned
  field.

Reported-by: swildner
---
 sys/vm/vm_page.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index 455523b47b..dd9a9a9b55 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -592,7 +592,7 @@ vm_page_startup_finish(void *dummy __unused)
 				blk, count, rblk);
 			break;
 		}
-		atomic_add_long(&vmstats.v_dma_pages, -count);
+		atomic_add_long(&vmstats.v_dma_pages, -(long)count);
 		spin_unlock(&vm_contig_spin);
 
 		m = PHYS_TO_VM_PAGE((vm_paddr_t)blk << PAGE_SHIFT);
-- 
2.11.4.GIT