linux-kernel - Re: [PATCH] Address Sparse Static Warning inside kernel/fork.c

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Message-Id: <200908061922.34515.arnd@arndb.de>
Date:	Thu, 6 Aug 2009 19:22:34 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Subrata Modak <subrata@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Sachin P Sant <sachinp@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Address Sparse Static Warning inside kernel/fork.c

On Thursday 06 August 2009, Subrata Modak wrote:
> --- a/kernel/fork.c	2009-08-05 12:00:51.000000000 +0530
> +++ b/kernel/fork.c	2009-08-06 22:26:30.000000000 +0530
> @@ -78,7 +78,7 @@
>  unsigned long total_forks;	/* Handle normal Linux uptimes. */
>  int nr_threads; 		/* The idle threads do not count.. */
>  
> -int max_threads;		/* tunable limit on nr_threads */
> +static int max_threads;		/* tunable limit on nr_threads */
>  
>  DEFINE_PER_CPU(unsigned long, process_counts) = 0;
>  
> @@ -168,7 +168,7 @@ void __put_task_struct(struct task_struc
>  #define arch_task_cache_init()
>  #endif
>  
> -void __init fork_init(unsigned long mempages)
> +static void __init fork_init(unsigned long mempages)
>  {
>  #ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
>  #ifndef ARCH_MIN_TASKALIGN

These are both wrong (you didn't try compiling the kernel with
that patch, did you?):
fork_init() is called from init/main.c, max_threads is accessed
in kernel/sysctl.c.

If you had tried building this, you would have seen a warning about
unused symbols in the compile stage, followed by a linker error.

I would still be good to address these two though. Please do a
patch that moves the extern declarations for these two symbols
to an appropriate header file that is included in fork.c.

	Arnd <><
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