From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: "'David Gibson'" <david@gibson.dropbear.id.au>,
<linux-ia64@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: RE: IA64 non-contiguous memory space bugs
Date: Tue, 21 Feb 2006 17:31:59 -0800 [thread overview]
Message-ID: <200602220132.k1M1Vxg09552@unix-os.sc.intel.com> (raw)
In-Reply-To: <20060222001359.GA23574@localhost.localdomain>
David Gibson wrote on Tuesday, February 21, 2006 4:14 PM
> Second problem is in the hugepage logic in free_pgtables()
> (mm/memory.c). As far as I can tell it's complete crap, and only
> works by accident, for different accidental reasons on ppc64 and ia64,
> the only archs that have a non-trivial is_hugepage_only_range().
> Except that I'm not sure it does entirely work by accident on ia64:
> suppose a process has a hugepage mapping that begins some way after
> the beginning of the hugepage address range. Before
> hugetlb_free_pgd_range() gets called on that area, it will be called
> on the next normal page VMA down - but with an end address at the
> beginning of the hugepage VMA and so extending into the hugepage
> address range. I don't really understand the ia64 pagetable mapping
> stuff well enough to tell if that's dangerous or not.
I don't see any problem in the ia64 code. The start and end address is
what the vma specified. Floor and ceiling is just a hint for free_pgtables()
to free any left over page tables between vma holes (to prev and next).
As far as I can tell, the code looks fine.
- Ken
next prev parent reply other threads:[~2006-02-22 1:32 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-22 0:13 IA64 non-contiguous memory space bugs David Gibson
2006-02-22 0:39 ` David S. Miller
2006-02-22 2:17 ` David Gibson
2006-02-22 1:31 ` Chen, Kenneth W [this message]
2006-02-22 1:51 ` Chen, Kenneth W
2006-02-22 2:25 ` 'David Gibson'
2006-02-22 2:45 ` Chen, Kenneth W
2006-02-22 16:35 ` Hugh Dickins
2006-02-22 23:49 ` 'David Gibson'
2006-02-23 20:13 ` Hugh Dickins
2006-02-24 0:11 ` 'David Gibson'
2006-02-24 1:14 ` Chen, Kenneth W
2006-02-24 2:46 ` 'David Gibson'
2006-02-22 2:15 ` 'David Gibson'
2006-02-22 2:53 ` Chen, Kenneth W
2006-02-22 3:55 ` David Mosberger-Tang
2006-02-22 4:02 ` David Gibson
2006-02-22 16:19 ` Chen, Kenneth W
2006-02-22 23:26 ` 'David Gibson'
2006-02-22 3:01 Zhang, Yanmin
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