[src/trunk]: src/sys/uvm need to use PGO_NOBLOCKALLOC also in ubc_alloc_direc...

[jdolecek <jdolecek%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/20029ce00216
branches:  trunk
changeset: 446024:20029ce00216
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Tue Nov 20 20:07:19 2018 +0000

description:
need to use PGO_NOBLOCKALLOC also in ubc_alloc_direct() case, same
as non-direct code - otherwise the code tries to acquire the wapbl
lock again in genfs_getpages(), and panic due to locking against itself

towards PR kern/53124

diffstat:

 sys/uvm/uvm_bio.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (28 lines):

diff -r 01abeab5fd4f -r 20029ce00216 sys/uvm/uvm_bio.c
--- a/sys/uvm/uvm_bio.c Tue Nov 20 19:19:21 2018 +0000
+++ b/sys/uvm/uvm_bio.c Tue Nov 20 20:07:19 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_bio.c,v 1.97 2018/06/02 15:24:55 chs Exp $ */
+/*     $NetBSD: uvm_bio.c,v 1.98 2018/11/20 20:07:19 jdolecek Exp $    */
 
 /*
  * Copyright (c) 1998 Chuck Silvers.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.97 2018/06/02 15:24:55 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.98 2018/11/20 20:07:19 jdolecek Exp $");
 
 #include "opt_uvmhist.h"
 #include "opt_ubc.h"
@@ -814,7 +814,8 @@
 {
        voff_t pgoff;
        int error;
-       int gpflags = flags | PGO_NOTIMESTAMP | PGO_SYNCIO | PGO_ALLPAGES;
+       int gpflags = flags | PGO_NOTIMESTAMP | PGO_SYNCIO | PGO_ALLPAGES
+           | PGO_NOBLOCKALLOC;
        int access_type = VM_PROT_READ;
        UVMHIST_FUNC("ubc_alloc_direct"); UVMHIST_CALLED(ubchist);