linux-kernel - Re: [PATCH 4/5 V2] Build hugetlb backed process stacks

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Date:	Mon, 28 Jul 2008 13:37:38 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Eric Munson <ebmunson@...ibm.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, libhugetlbfs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 4/5 V2] Build hugetlb backed process stacks

On Mon, 2008-07-28 at 12:17 -0700, Eric Munson wrote:
> 
> +static int move_to_huge_pages(struct linux_binprm *bprm,
> +                               struct vm_area_struct *vma, unsigned
> long shift)
> +{
> +       struct mm_struct *mm = vma->vm_mm;
> +       struct vm_area_struct *new_vma;
> +       unsigned long old_end = vma->vm_end;
> +       unsigned long old_start = vma->vm_start;
> +       unsigned long new_end = old_end - shift;
> +       unsigned long new_start, length;
> +       unsigned long arg_size = new_end - bprm->p;
> +       unsigned long flags = vma->vm_flags;
> +       struct file *hugefile = NULL;
> +       unsigned int stack_hpages = 0;
> +       struct page **from_pages = NULL;
> +       struct page **to_pages = NULL;
> +       unsigned long num_pages = (arg_size / PAGE_SIZE) + 1;
> +       int ret;
> +       int i;
> +
> +#ifdef CONFIG_STACK_GROWSUP

Why do you have the #ifdef for the CONFIG_STACK_GROWSUP=y case in that
first patch if you don't support CONFIG_STACK_GROWSUP=y?

I think it might be worth some time to break this up a wee little bit.
16 local variables is a big on the beefy side. :)

-- Dave

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