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Message-ID: <20211027050920-mutt-send-email-mst@kernel.org>
Date:   Wed, 27 Oct 2021 05:10:18 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Max Gurtovoy <mgurtovoy@...dia.com>
Cc:     Arnd Bergmann <arnd@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Feng Li <lifeng1519@...il.com>,
        Israel Rukshin <israelr@...dia.com>,
        Arnd Bergmann <arnd@...db.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Damien Le Moal <damien.lemoal@....com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio-blk: select CONFIG_SG_POOL

https://lore.kernel.org/r/20210901131434.31158-1-mgurtovoy@nvidia.com

yes - it was there. I think I dropped it while resolving
conflicts.
Thanks!


On Wed, Oct 27, 2021 at 11:56:20AM +0300, Max Gurtovoy wrote:
> This is strange, I've sent V3 with this code included.
> 
> MST,
> 
> which version did you take to your tree ?
> 
> 
> On 10/27/2021 11:24 AM, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> > 
> > Switching virtio-blk to the sg_pool interfaces causes a build
> > failures when they are not part of the kernel:
> > 
> > drivers/block/virtio_blk.c:182:3: error: implicit declaration of function 'sg_free_table_chained' [-Werror,-Wimplicit-function-declaration]
> >                  sg_free_table_chained(&vbr->sg_table,
> >                  ^
> > drivers/block/virtio_blk.c:195:8: error: implicit declaration of function 'sg_alloc_table_chained' [-Werror,-Wimplicit-function-declaration]
> >          err = sg_alloc_table_chained(&vbr->sg_table,
> >                ^
> > 
> > Select this symbol through Kconfig, as is done for all other
> > users.
> > 
> > Fixes: b2c5221fd074 ("virtio-blk: avoid preallocating big SGL for data")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
> >   drivers/block/Kconfig | 1 +
> >   1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
> > index d97eaf6adb6d..2a51dfb09c8f 100644
> > --- a/drivers/block/Kconfig
> > +++ b/drivers/block/Kconfig
> > @@ -371,6 +371,7 @@ config XEN_BLKDEV_BACKEND
> >   config VIRTIO_BLK
> >   	tristate "Virtio block driver"
> >   	depends on VIRTIO
> > +	select SG_POOL
> >   	help
> >   	  This is the virtual block driver for virtio.  It can be used with
> >             QEMU based VMMs (like KVM or Xen).  Say Y or M.

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