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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: schwidefsky@de.ibm.com
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [patch 3/3] arch_rebalance_pgtables call
Date: Tue, 13 Nov 2007 23:33:37 +1100	[thread overview]
Message-ID: <200711132333.38086.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <20071112144010.052155135@de.ibm.com>

On Tuesday 13 November 2007 01:30, schwidefsky@de.ibm.com wrote:
> From: Martin Schwidefsky <schwidefsky@de.ibm.com>
>
> In order to change the layout of the page tables after an mmap has
> crossed the adress space limit of the current page table layout a
> architecture hook in get_unmapped_area is needed. The arguments
> are the address of the new mapping and the length of it.

Can you comment what this is supposed to be fore somewhere?


> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
> ---
>
>  mm/mmap.c |    6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> Index: linux-2.6/mm/mmap.c
> ===================================================================
> --- linux-2.6.orig/mm/mmap.c
> +++ linux-2.6/mm/mmap.c
> @@ -36,6 +36,10 @@
>  #define arch_mmap_check(addr, len, flags)	(0)
>  #endif
>
> +#ifndef arch_rebalance_pgtables
> +#define arch_rebalance_pgtables(addr, len)		(addr)
> +#endif
> +
>  static void unmap_region(struct mm_struct *mm,
>  		struct vm_area_struct *vma, struct vm_area_struct *prev,
>  		unsigned long start, unsigned long end);
> @@ -1436,7 +1440,7 @@ get_unmapped_area(struct file *file, uns
>  	if (addr & ~PAGE_MASK)
>  		return -EINVAL;
>
> -	return addr;
> +	return arch_rebalance_pgtables(addr, len);
>  }
>
>  EXPORT_SYMBOL(get_unmapped_area);

  reply	other threads:[~2007-11-14  0:36 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-11-12 14:30 [patch 0/3] page table changes schwidefsky
2007-11-12 14:30 ` [patch 1/3] add mm argument to pte/pmd/pud/pgd_free schwidefsky
2007-11-12 14:30 ` [patch 2/3] CONFIG_HIGHPTE vs. sub-page page tables schwidefsky
2008-01-02 20:44   ` Christoph Hellwig
2008-01-02 21:24     ` Geert Uytterhoeven
2008-01-02 21:28       ` Benjamin Herrenschmidt
2008-01-03 13:12     ` Andi Kleen
2008-01-03 14:01       ` Boaz Harrosh
2008-02-01 23:15   ` Andrew Morton
2008-02-03  5:37     ` Benjamin Herrenschmidt
2008-02-03  5:53       ` Andrew Morton
2008-02-03  6:46         ` Ingo Molnar
2008-02-04 10:36         ` Martin Schwidefsky
2008-02-04 10:51           ` Andrew Morton
2008-02-04 11:02             ` Russell King
2008-02-04 11:14               ` Andrew Morton
2008-02-05 14:39             ` Martin Schwidefsky
2008-02-05 18:46               ` Andrew Morton
2008-02-06  9:06                 ` Martin Schwidefsky
2008-02-06  9:09                   ` Andrew Morton
2008-02-06  9:15                     ` Ingo Molnar
2008-02-06 15:50                     ` Martin Schwidefsky
2007-11-12 14:30 ` [patch 3/3] arch_rebalance_pgtables call schwidefsky
2007-11-13 12:33   ` Nick Piggin [this message]
2007-11-14  9:26     ` Martin Schwidefsky
2007-11-14 10:06       ` Benjamin Herrenschmidt
2007-11-14 11:49         ` Martin Schwidefsky
2007-11-14 22:07           ` Benjamin Herrenschmidt
2007-11-15 17:13             ` Martin Schwidefsky

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