linux-kernel - Re: [PATCH 1/5 V2] Align stack boundaries based on personality

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Date:	Mon, 28 Jul 2008 13:09:53 -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,
	Andy Whitcroft <apw@...dowen.org>
Subject: Re: [PATCH 1/5 V2] Align stack boundaries based on personality

On Mon, 2008-07-28 at 12:17 -0700, Eric Munson wrote:
> 
> +static unsigned long personality_page_align(unsigned long addr)
> +{
> +       if (current->personality & HUGETLB_STACK)
> +#ifdef CONFIG_STACK_GROWSUP
> +               return HPAGE_ALIGN(addr);
> +#else
> +               return addr & HPAGE_MASK;
> +#endif
> +
> +       return PAGE_ALIGN(addr);
> +}
...
> -       stack_top = PAGE_ALIGN(stack_top);
> +       stack_top = personality_page_align(stack_top);

Just out of curiosity, why doesn't the existing small-page case seem to
care about the stack growing up/down?  Why do you need to care in the
large page case?

-- Dave

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