Re: [patch] ipv4: initialize arp_tbl rw lock

[Heiko Carstens <heiko.carstens@de.ibm.com>]

> > The qeth driver makes use of the arp_tbl rw lock. CONFIG_DEBUG_SPINLOCK
> > detects that this lock is not initialized as it is supposed to be.
>
> This is a initialization order problem then, because:
> 	arp_init
> 	   neigh_table_init
> 		rwlock_init
> 
> does the initialization already. So fix the initialization sequence
> of the qeth driver or you will have other problems.
> 
> My impression was the -rt folks wanted all lock initializations t be
> done at runtime not compile time.

Ok, so the problem seems to be that inet_init gets called after qeth_init.
Looking at the top level Makefile this seems to be true for all network
drivers in drivers/net/ and drivers/s390/net/ since we have

vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)

The patch below works for me... I guess there must be a better way to make
sure that any networking driver's initcall is made before inet_init?

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---

 Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index b401942..c5cea07 100644
--- a/Makefile
+++ b/Makefile
@@ -567,7 +567,7 @@ #
 # System.map is generated to document addresses of all kernel symbols
 
 vmlinux-init := $(head-y) $(init-y)
-vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
+vmlinux-main := $(core-y) $(libs-y) $(net-y) $(drivers-y)
 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds