linux-kernel - Re: [PATCH] fix improper .init-type section references

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Date:	Tue, 12 Jun 2007 15:12:21 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Jan Beulich" <jbeulich@...ell.com>
Cc:	linux-kernel@...r.kernel.org, "Sam Ravnborg" <sam@...nborg.org>
Subject: Re: [PATCH] fix improper .init-type section references

Hi Jan,

On 6/12/07, Jan Beulich <jbeulich@...ell.com> wrote:
> .. which modpost started warning about.
>
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
>
>  kernel/kthread.c |    2 +-
>  mm/page_alloc.c  |   18 +++++++++---------
>  2 files changed, 10 insertions(+), 10 deletions(-)
>
> --- linux-2.6.22-rc4/kernel/kthread.c   2007-06-11 18:09:47.000000000 +0200
> +++ 2.6.22-rc4-init-attribs/kernel/kthread.c    2007-06-11 09:10:42.000000000 +0200
> @@ -215,7 +215,7 @@ int kthread_stop(struct task_struct *k)
>  EXPORT_SYMBOL(kthread_stop);
>
>
> -static __init void kthreadd_setup(void)
> +static noinline __init_refok void kthreadd_setup(void)
>  {
>         struct task_struct *tsk = current;

This isn't ok. There isn't any __init function that is (safely) referenced
by kthreadd_setup(), so we shouldn't really be marking it as such.
Also, kthreadd_setup() is really only ever called at init time, so we'd
want it to remain __init.

I believe the correct fix to silence modpost here would be to mark its
caller kthreadd() also as __init, because it too is used only at init time?

[ Cc:'ing Sam. ]

> --- linux-2.6.22-rc4/mm/page_alloc.c    2007-06-11 18:09:49.000000000 +0200
> +++ 2.6.22-rc4-init-attribs/mm/page_alloc.c     2007-06-11 09:10:42.000000000 +0200
> @@ -126,13 +126,13 @@ static unsigned long __meminitdata dma_r
>      #endif
>    #endif
>
> -  struct node_active_region __meminitdata early_node_map[MAX_ACTIVE_REGIONS];
> -  int __meminitdata nr_nodemap_entries;
> -  unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
> -  unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
> +  static struct node_active_region __meminitdata early_node_map[MAX_ACTIVE_REGIONS];
> +  static int __meminitdata nr_nodemap_entries;
> +  static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
> +  static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
>  #ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
> -  unsigned long __initdata node_boundary_start_pfn[MAX_NUMNODES];
> -  unsigned long __initdata node_boundary_end_pfn[MAX_NUMNODES];
> +  static unsigned long __meminitdata node_boundary_start_pfn[MAX_NUMNODES];
> +  static unsigned long __meminitdata node_boundary_end_pfn[MAX_NUMNODES];

Umm, can't really comment on mm/ code, but this could've been a
separate patch ... (the simple non-static to static conversions, at least)

Satyam
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