On 4/4/18 6:12 AM, Arnd Bergmann wrote:
> The __net_initdata section cannot currently be used for structures that
> get cleaned up in an exitcall using unregister_pernet_operations:
>
> WARNING: vmlinux.o(.text+0x868c34): Section mismatch in reference from the
> function nsim_devlink_exit() to the (unknown reference) .init.data:(unknown)
> The function nsim_devlink_exit() references
> the (unknown reference) __initdata (unknown).
> This is often because nsim_devlink_exit lacks a __initdata
> annotation or the annotation of (unknown) is wrong.
> WARNING: vmlinux.o(.text+0x868c64): Section mismatch in reference from the
> function nsim_devlink_init() to the (unknown reference) .init.data:(unknown)
> WARNING: vmlinux.o(.text+0x8692bc): Section mismatch in reference from the
> function nsim_fib_exit() to the (unknown reference) .init.data:(unknown)
> WARNING: vmlinux.o(.text+0x869300): Section mismatch in reference from the
> function nsim_fib_init() to the (unknown reference) .init.data:(unknown)
>
> As that warning tells us, discarding the structure after a module is
> loaded would lead to a undefined behavior when that module is removed.
>
> It might be possible to change that annotation so it has no effect for
> loadable modules, but I have not figured out exactly how to do that, and
> we want this to be fixed in -rc1.
>
> This just removes the annotations, just like we do for all other such
> modules.
>
> Fixes: 37923ed6b8ce ("netdevsim: Add simple FIB resource controller via
> devlink")
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
> ---
> drivers/net/netdevsim/devlink.c | 2 +-
> drivers/net/netdevsim/fib.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/netdevsim/devlink.c b/drivers/net/netdevsim/devlink.c
> index 27ae05c5fdaf..1dba47936456 100644
> --- a/drivers/net/netdevsim/devlink.c
> +++ b/drivers/net/netdevsim/devlink.c
> @@ -267,7 +267,7 @@ static int __net_init nsim_devlink_netns_init(struct net
> *net)
> return 0;
> }
>
> -static struct pernet_operations nsim_devlink_net_ops __net_initdata = {
> +static struct pernet_operations nsim_devlink_net_ops = {
> .init = nsim_devlink_netns_init,
> .id = &nsim_devlink_id,
> .size = sizeof(bool),
> diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c
> index 0d105bafa261..9bfe9e151e13 100644
> --- a/drivers/net/netdevsim/fib.c
> +++ b/drivers/net/netdevsim/fib.c
> @@ -230,7 +230,7 @@ static int __net_init nsim_fib_netns_init(struct net *net)
> return 0;
> }
>
> -static struct pernet_operations nsim_fib_net_ops __net_initdata = {
> +static struct pernet_operations nsim_fib_net_ops = {
> .init = nsim_fib_netns_init,
> .id = &nsim_fib_net_id,
> .size = sizeof(struct nsim_fib_data),
>
I am confused ... I do the same thing in the VRF driver and that code
has been there since June 2017.
