linux-kernel - Re: [PATCH RESEND] hugetlb: fix CONFIG

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Message-Id: <20080725142921.2238dc5a.akpm@linux-foundation.org>
Date:	Fri, 25 Jul 2008 14:29:21 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nishanth Aravamudan <nacc@...ibm.com>
Cc:	alan@...rguk.ukuu.org.uk, torvalds@...ux-foundation.org,
	mingo@...e.hu, randy.dunlap@...cle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] hugetlb: fix CONFIG_SYSCTL=n build

On Fri, 25 Jul 2008 13:33:51 -0700
Nishanth Aravamudan <nacc@...ibm.com> wrote:

> [resending with Linus' address fixed]
> 
> On 25.07.2008 [18:09:35 +0100], Alan Cox wrote:
> > On Thu, 24 Jul 2008 07:26:03 +0200
> > Ingo Molnar <mingo@...e.hu> wrote:
> > 
> > > 
> > > not sure it's known but despite all the fixes i still get:
> > > 
> > >  drivers/built-in.o: In function `ne_drv_resume':
> > >  ne.c:(.text+0x146ba4): undefined reference to `NS8390_init'
> > >  drivers/built-in.o: In function `ne_block_output':
> > >  ne.c:(.text+0x146e00): undefined reference to `NS8390_init'
> > 
> > This should do the trick. I can't test it currently as that configuration
> > now fails to build with mm errors in current git head..
> > 
> > mm/hugetlb.c: In function ???hugetlb_acct_memory???: mm/hugetlb.c:1507:
> > error: implicit declaration of function ???cpuset_mems_nr???

Remind me to give a wedgie to the next gcc developer I meet.

> 
> When moving the intialization functions around, I did not remove the
> dependency of some helpers on CONFIG_SYSCTL. This led to a large chunk
> of code being elided even though it is needed to build hugetlb.o.
> 
> Fixes a build failure reported by Alan Cox:
> 
> mm/hugetlb.c: In function ______hugetlb_acct_memory______: mm/hugetlb.c:1507:
> error: implicit declaration of function ______cpuset_mems_nr______

And the next one.

LANG=C stomps this silliness.

> Signed-off-by: Nishanth Aravamudan <nacc@...ibm.com>
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 41341c4..3be79dc 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1026,7 +1026,6 @@ static void __init report_hugepages(void)
>  	}
>  }
>  
> -#ifdef CONFIG_SYSCTL
>  #ifdef CONFIG_HIGHMEM
>  static void try_to_free_low(struct hstate *h, unsigned long count)
>  {
> @@ -1386,6 +1385,7 @@ static unsigned int cpuset_mems_nr(unsigned int *array)
>  	return nr;
>  }
>  
> +#ifdef CONFIG_SYSCTL
>  int hugetlb_sysctl_handler(struct ctl_table *table, int write,
>  			   struct file *file, void __user *buffer,
>  			   size_t *length, loff_t *ppos)
> 

OK, we had a fix from Ingo but this one is better.
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