[PATCH] virtio-blk: select CONFIG_SG_POOL

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.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@arndb.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.
-- 
2.29.2