diff --git a/sys/alpha/alpha/vm_machdep.c b/sys/alpha/alpha/vm_machdep.c
index 6e302cdf8288..076139dcd3f2 100644
--- a/sys/alpha/alpha/vm_machdep.c
+++ b/sys/alpha/alpha/vm_machdep.c
@@ -303,7 +303,7 @@ vmapbuf(bp)
 		 * Do the vm_fault if needed; do the copy-on-write thing
 		 * when reading stuff off device into memory.
 		 */
-		vm_fault_quick(addr,
+		vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
 			(bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
 		pa = trunc_page(pmap_kextract((vm_offset_t) addr));
 		if (pa == 0)
diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c
index 573e1f11e7df..2a1dc22ee8a6 100644
--- a/sys/amd64/amd64/vm_machdep.c
+++ b/sys/amd64/amd64/vm_machdep.c
@@ -357,7 +357,7 @@ vmapbuf(bp)
 		 * Do the vm_fault if needed; do the copy-on-write thing
 		 * when reading stuff off device into memory.
 		 */
-		vm_fault_quick(addr,
+		vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
 			(bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
 		pa = trunc_page(pmap_kextract((vm_offset_t) addr));
 		if (pa == 0)
diff --git a/sys/i386/i386/vm_machdep.c b/sys/i386/i386/vm_machdep.c
index 573e1f11e7df..2a1dc22ee8a6 100644
--- a/sys/i386/i386/vm_machdep.c
+++ b/sys/i386/i386/vm_machdep.c
@@ -357,7 +357,7 @@ vmapbuf(bp)
 		 * Do the vm_fault if needed; do the copy-on-write thing
 		 * when reading stuff off device into memory.
 		 */
-		vm_fault_quick(addr,
+		vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
 			(bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
 		pa = trunc_page(pmap_kextract((vm_offset_t) addr));
 		if (pa == 0)
diff --git a/sys/ia64/ia64/vm_machdep.c b/sys/ia64/ia64/vm_machdep.c
index 882195392d63..81c5c4a95a5e 100644
--- a/sys/ia64/ia64/vm_machdep.c
+++ b/sys/ia64/ia64/vm_machdep.c
@@ -356,7 +356,7 @@ vmapbuf(bp)
 		 * Do the vm_fault if needed; do the copy-on-write thing
 		 * when reading stuff off device into memory.
 		 */
-		vm_fault_quick(addr,
+		vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
 			(bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
 		pa = trunc_page(pmap_kextract((vm_offset_t) addr));
 		if (pa == 0)
diff --git a/sys/powerpc/aim/vm_machdep.c b/sys/powerpc/aim/vm_machdep.c
index c2110bba9a66..baf59a04637a 100644
--- a/sys/powerpc/aim/vm_machdep.c
+++ b/sys/powerpc/aim/vm_machdep.c
@@ -218,7 +218,7 @@ vmapbuf(bp)
 		 * Do the vm_fault if needed; do the copy-on-write thing
 		 * when reading stuff off device into memory.
 		 */
-		vm_fault_quick(addr,
+		vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
 			(bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
 		pa = trunc_page(pmap_kextract((vm_offset_t) addr));
 		if (pa == 0)
diff --git a/sys/powerpc/powerpc/vm_machdep.c b/sys/powerpc/powerpc/vm_machdep.c
index c2110bba9a66..baf59a04637a 100644
--- a/sys/powerpc/powerpc/vm_machdep.c
+++ b/sys/powerpc/powerpc/vm_machdep.c
@@ -218,7 +218,7 @@ vmapbuf(bp)
 		 * Do the vm_fault if needed; do the copy-on-write thing
 		 * when reading stuff off device into memory.
 		 */
-		vm_fault_quick(addr,
+		vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
 			(bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ);
 		pa = trunc_page(pmap_kextract((vm_offset_t) addr));
 		if (pa == 0)