linux-kernel - Re: [PATCH] tools/virtio: Test virtual address range detection

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Date:   Wed, 16 Mar 2022 14:41:35 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tools/virtio: Test virtual address range detection

On Tue, Feb 22, 2022 at 11:18:18PM +0000, Matthew Wilcox wrote:
> On Tue, Feb 22, 2022 at 07:58:33AM +0000, David Woodhouse wrote:
> > On Tue, 2022-02-22 at 01:31 -0500, Michael S. Tsirkin wrote:
> > > On Mon, Feb 21, 2022 at 05:18:48PM +0000, David Woodhouse wrote:
> > > > 
> > > > [dwoodhou@i7 virtio]$ sudo ~/virtio_test
> > > > Detected virtual address range 0x1000-0x7ffffffff000
> > > > spurious wakeups: 0x0 started=0x100000 completed=0x100000
> > > > 
> > > > Although in some circumstances I also see a different build failure:
> > > > 
> > > > cc -g -O2 -Werror -Wno-maybe-uninitialized -Wall -I. -I../include/ -I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -include ../../include/linux/kconfig.h   -c -o vringh_test.o vringh_test.c
> 
> Trying to test this myself ...
> 
> $ cd tools/virtio/
> $ make
> ...
> cc -lpthread  virtio_test.o virtio_ring.o   -o virtio_test
> /usr/bin/ld: virtio_ring.o: in function `spin_lock':
> /home/willy/kernel/folio/tools/virtio/./linux/spinlock.h:16: undefined reference to `pthread_spin_lock'
> 
> So this is not the only problem here?

FYI, this fixes it for me:

diff --git a/tools/virtio/Makefile b/tools/virtio/Makefile
index 0d7bbe49359d..83b6a522d0d2 100644
--- a/tools/virtio/Makefile
+++ b/tools/virtio/Makefile
@@ -5,7 +5,7 @@ virtio_test: virtio_ring.o virtio_test.o
 vringh_test: vringh_test.o vringh.o virtio_ring.o

 CFLAGS += -g -O2 -Werror -Wno-maybe-uninitialized -Wall -I. -I../include/ -I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -include ../../include/linux/kconfig.h
-LDFLAGS += -lpthread
+LDFLAGS += -pthread
 vpath %.c ../../drivers/virtio ../../drivers/vhost
 mod:
        ${MAKE} -C `pwd`/../.. M=`pwd`/vhost_test V=${V}