• Pavel Emelyanov's avatar
    [NETNS]: Move some code into __init section when CONFIG_NET_NS=n · 4665079c
    Pavel Emelyanov authored
    With the net namespaces many code leaved the __init section,
    thus making the kernel occupy more memory than it did before.
    Since we have a config option that prohibits the namespace
    creation, the functions that initialize/finalize some netns
    stuff are simply not needed and can be freed after the boot.
    
    Currently, this is almost not noticeable, since few calls
    are no longer in __init, but when the namespaces will be
    merged it will be possible to free more code. I propose to
    use the __net_init, __net_exit and __net_initdata "attributes"
    for functions/variables that are not used if the CONFIG_NET_NS
    is not set to save more space in memory.
    
    The exiting functions cannot just reside in the __exit section,
    as noticed by David, since the init section will have
    references on it and the compilation will fail due to modpost
    checks. These references can exist, since the init namespace
    never dies and the exit callbacks are never called. So I
    introduce the __exit_refok attribute just like it is already
    done with the __init_refok.
    Signed-off-by: default avatarPavel Emelyanov <xemul@openvz.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    4665079c
dev.c 107 KB