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SubjectRe: [PATCH -next] drivers/net: Makefile, fix netconsole link order
On Sat, 10 Sep 2011 10:43:32 +0800 Lin Ming <ming.m.lin@intel.com> wrote:

> On Sat, 2011-09-10 at 08:00 +0800, Andrew Morton wrote:
>
> > > +obj-$(CONFIG_NETCONSOLE) += netconsole.o
> >
> > It would be preferable to fix this with initcall ordering. Perhaps by
> > switching init_netconsole() to subsys_initcall.
>
> subsys_initcall is defined as __define_initcall("4",fn,4).
> In !MODULE case, device driver module_int() is defined as
> __define_initcall("6",fn,6)

oop, yes, I am chronologically challenged.

> If we use subsys_initcall for init_netconsole, it will still be called
> before network device driver is initialized.
>
> How about late_initcall?
>
> (Not tested yet)
>
> >From 11f4f035e96ff430192d0a75552dd715acb5f3b8 Mon Sep 17 00:00:00 2001
> From: Lin Ming <ming.m.lin@intel.com>
> Date: Sat, 10 Sep 2011 10:36:10 +0800
> Subject: [PATCH] drivers/net: Makefile, fix netconsole link order
>
> Commit 88491d8(drivers/net: Kconfig & Makefile cleanup) causes a
> regression that netconsole does not work if netconsole and network
> device driver are build into kernel, because netconsole is linked before
> network device driver.
>
> Fixes it by switching init_netconsole() to late_initcall if it's
> build-in.
>
> Signed-off-by: Lin Ming <ming.m.lin@intel.com>
> ---
> drivers/net/netconsole.c | 4 ++++
> 1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
> index dfc8272..914be29 100644
> --- a/drivers/net/netconsole.c
> +++ b/drivers/net/netconsole.c
> @@ -799,5 +799,9 @@ static void __exit cleanup_netconsole(void)
> }
> }
>
> +#ifdef MODULE
> module_init(init_netconsole);
> module_exit(cleanup_netconsole);
> +#else
> +late_initcall(init_netconsole);
> +#endif /* !MODULE */

That should work, unless any net driver is weirdly also using
late_initcall. But if there are such drivers, they would have failed
with the old Makefile ordering.



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