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From: schwidefsky@de.ibm.com
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: [patch 3/3] arch_rebalance_pgtables call
Date: Mon, 12 Nov 2007 15:30:12 +0100	[thread overview]
Message-ID: <20071112144010.052155135@de.ibm.com> (raw)
In-Reply-To: <20071112143009.425807965@de.ibm.com>

[-- Attachment #1: 003-mm-update-pgd.diff --]
[-- Type: text/plain, Size: 1255 bytes --]

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.

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);

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.


  parent reply	other threads:[~2007-11-12 14:40 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 ` schwidefsky [this message]
2007-11-13 12:33   ` [patch 3/3] arch_rebalance_pgtables call Nick Piggin
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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