[PATCH net-next v1] memory-provider: disable building dmabuf mp on !CONFIG_PAGE_POOL

[Mina Almasry]

When CONFIG_TRACEPOINTS=y but CONFIG_PAGE_POOL=n, we end up with this
build failure that is reported by the 0-day bot:

ld: vmlinux.o: in function `mp_dmabuf_devmem_alloc_netmems':
>> (.text+0xc37286): undefined reference to `__tracepoint_page_pool_state_hold'
>> ld: (.text+0xc3729a): undefined reference to `__SCT__tp_func_page_pool_state_hold'
>> ld: vmlinux.o:(__jump_table+0x10c48): undefined reference to `__tracepoint_page_pool_state_hold'
>> ld: vmlinux.o:(.static_call_sites+0xb824): undefined reference to `__SCK__tp_func_page_pool_state_hold'

The root cause is that in this configuration, traces are enabled but the
page_pool specific trace_page_pool_state_hold is not registered.

There is no reason to build the dmabuf memory provider when
CONFIG_PAGE_POOL is not present, as it's really a provider to the
page_pool.

In fact the whole NET_DEVMEM is RX path-only at the moment, so we can
make the entire config dependent on the PAGE_POOL.

Note that this may need to be revisited after/while devmem TX is
added,  as devmem TX likely does not need CONFIG_PAGE_POOL. For now this
build fix is sufficient.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202409131239.ysHQh4Tv-lkp@xxxxxxxxx/
Signed-off-by: Mina Almasry <almasrymina@xxxxxxxxxx>

---
 net/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/Kconfig b/net/Kconfig
index 7574b066d7cd..a629f92dc86b 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -70,6 +70,7 @@ config NET_DEVMEM
 	def_bool y
 	depends on DMA_SHARED_BUFFER
 	depends on GENERIC_ALLOCATOR
+	depends on PAGE_POOL
 
 menu "Networking options"
 
-- 
2.46.0.662.g92d0881bb0-goog