mptcp: select CRYPTO

Without this modification and if CRYPTO is not selected, we have this
warning:

  WARNING: unmet direct dependencies detected for CRYPTO_LIB_SHA256
    Depends on [n]: CRYPTO [=n]
    Selected by [y]:
    - MPTCP [=y] && NET [=y] && INET [=y]

MPTCP selects CRYPTO_LIB_SHA256 which seems to depend on CRYPTO. CRYPTO
is now selected to avoid this issue.

Even though the config system prints that warning, it looks like
sha256.c is compiled and linked even without CONFIG_CRYPTO. Since MPTCP
will end up needing CONFIG_CRYPTO anyway in future commits -- currently
in preparation for net-next -- we propose to add it now to fix the
warning.

The dependency in the config system comes from the fact that
CRYPTO_LIB_SHA256 is defined in "lib/crypto/Kconfig" which is sourced
from "crypto/Kconfig" only if CRYPTO is selected.

Fixes: 65492c5a6ab5 (mptcp: move from sha1 (v0) to sha256 (v1))
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/Kconfig b/net/mptcp/Kconfig
index 49f6054..a9ed3bf 100644 (file)
--- a/net/mptcp/Kconfig
+++ b/net/mptcp/Kconfig
@@ -4,6 +4,7 @@ config MPTCP
        depends on INET
        select SKB_EXTENSIONS
        select CRYPTO_LIB_SHA256
+       select CRYPTO
        help
          Multipath TCP (MPTCP) connections send and receive data over multiple
          subflows in order to utilize multiple network paths. Each subflow