Mana uses PAGE_POOL API. x86_64 defconfig doesn't select it:

ld: vmlinux.o: in function `mana_create_page_pool.isra.0':
mana_en.c:(.text+0x9ae36f): undefined reference to `page_pool_create'
ld: vmlinux.o: in function `mana_get_rxfrag':
mana_en.c:(.text+0x9afed1): undefined reference to `page_pool_alloc_pages'
make[3]: *** [/home/yury/work/linux/scripts/Makefile.vmlinux:37: vmlinux] Error 
1
make[2]: *** [/home/yury/work/linux/Makefile:1154: vmlinux] Error 2
make[1]: *** [/home/yury/work/linux/Makefile:234: __sub-make] Error 2
make[1]: Leaving directory '/home/yury/work/build-linux-x86_64'
make: *** [Makefile:234: __sub-make] Error 2

So we need to select it explicitly.

Signed-off-by: Yury Norov <yury.no...@gmail.com>
---
 drivers/net/ethernet/microsoft/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/microsoft/Kconfig 
b/drivers/net/ethernet/microsoft/Kconfig
index 090e6b983243..01eb7445ead9 100644
--- a/drivers/net/ethernet/microsoft/Kconfig
+++ b/drivers/net/ethernet/microsoft/Kconfig
@@ -20,6 +20,7 @@ config MICROSOFT_MANA
        depends on PCI_MSI && X86_64
        depends on PCI_HYPERV
        select AUXILIARY_BUS
+       select PAGE_POOL
        help
          This driver supports Microsoft Azure Network Adapter (MANA).
          So far, the driver is only supported on X86_64.
-- 
2.40.1


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