linux-kernel - Re: [PATCH] virtio-blk: select CONFIG_SG

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Message-ID: <29dbebdd-185d-a3be-6131-c9a471dc8d39@nvidia.com>
Date:   Wed, 27 Oct 2021 11:56:20 +0300
From:   Max Gurtovoy <mgurtovoy@...dia.com>
To:     Arnd Bergmann <arnd@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Feng Li <lifeng1519@...il.com>,
        Israel Rukshin <israelr@...dia.com>
CC:     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

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.