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net: move 6lowpan compression code to separate module 

IEEE 802.15.4 and Bluetooth networking stacks share 6lowpan compression
code. Instead of introducing Makefile/Kconfig hacks, build this code as
a separate module referenced from both ieee802154 and bluetooth modules.

This fixes the following build error observed in some kernel
configurations:

net/built-in.o: In function `header_create': 6lowpan.c:(.text+0x166149): undefined reference to `lowpan_header_compress'
net/built-in.o: In function `bt_6lowpan_recv': (.text+0x166b3c): undefined reference to `lowpan_process_data'

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Dmitry Eremin-Solenikov <dmitry_eremin@mentor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Eremin-Solenikov 2014-01-15 02:50:40 +04:00 committed by David S. Miller
parent 89fc8632dd
commit a53d34c346
4 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/Makefile
View File

@ -57,7 +57,7 @@ obj-$(CONFIG_CAIF) += caif/
ifneq ($(CONFIG_DCB),)
obj-y += dcb/
endif
obj-$(CONFIG_IEEE802154) += ieee802154/
obj-y += ieee802154/
obj-$(CONFIG_MAC802154) += mac802154/
ifeq ($(CONFIG_NET),y)

1
net/bluetooth/Kconfig
View File

@ -12,6 +12,7 @@ menuconfig BT
select CRYPTO_AES
select CRYPTO_ECB
select CRYPTO_SHA256
select 6LOWPAN_IPHC
help
Bluetooth is low-cost, low-power, short-range wireless technology.
It was designed as a replacement for cables and other short-range

7
net/ieee802154/Kconfig
View File

@ -13,5 +13,12 @@ config IEEE802154
config IEEE802154_6LOWPAN
tristate "6lowpan support over IEEE 802.15.4"
depends on IEEE802154 && IPV6
select 6LOWPAN_IPHC
---help---
IPv6 compression over IEEE 802.15.4.
config 6LOWPAN_IPHC
tristate
---help---
6lowpan compression code which is shared between IEEE 802.15.4 and Bluetooth
stacks.

3
net/ieee802154/Makefile
View File

@ -1,5 +1,6 @@
obj-$(CONFIG_IEEE802154) += ieee802154.o af_802154.o
obj-$(CONFIG_IEEE802154_6LOWPAN) += 6lowpan.o 6lowpan_iphc.o
obj-$(CONFIG_IEEE802154_6LOWPAN) += 6lowpan.o
obj-$(CONFIG_6LOWPAN_IPHC) += 6lowpan_iphc.o
ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o wpan-class.o
af_802154-y := af_ieee802154.o raw.o dgram.o