From: Andrew Morton <akpm@osdl.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Hugh Dickins <hugh@veritas.com>,
Linux Memory Management <linux-mm@kvack.org>,
Ralf Baechle <ralf@linux-mips.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [patch] mm: mremap correct rmap accounting
Date: Sun, 28 Jan 2007 22:40:02 -0800 [thread overview]
Message-ID: <20070128224002.3e7da788.akpm@osdl.org> (raw)
In-Reply-To: <45BD6A7B.7070501@yahoo.com.au>
On Mon, 29 Jan 2007 14:31:07 +1100
Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> When mremap()ing virtual addresses, some architectures (read: MIPS) switches
> underlying pages if encountering ZERO_PAGE(old_vaddr) != ZERO_PAGE(new_vaddr).
>
> The problem is that the refcount and mapcount remain on the old page, while
> the actual pte is switched to the new one. This would counter underruns and
> confuse the rmap code.
umm, that sounds fairly fatal. For how long has this bug been present?
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next prev parent reply other threads:[~2007-01-29 6:40 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-23 14:19 [patch] mm: mremap correct rmap accounting Nick Piggin
2007-01-23 20:55 ` Hugh Dickins
2007-01-23 23:49 ` Nick Piggin
2007-01-29 3:31 ` Nick Piggin
2007-01-29 6:40 ` Andrew Morton [this message]
2007-01-29 6:57 ` Nick Piggin
2007-01-29 19:08 ` Hugh Dickins
2007-01-29 19:27 ` Linus Torvalds
2007-01-29 20:03 ` Andrew Morton
2007-01-29 20:18 ` Linus Torvalds
2007-01-29 21:27 ` Ralf Baechle
2007-01-29 20:10 ` Hugh Dickins
2007-01-29 20:22 ` Linus Torvalds
2007-01-29 20:38 ` Hugh Dickins
2007-01-29 21:24 ` Hugh Dickins
2007-01-30 1:00 ` Nick Piggin
2007-01-30 14:24 ` Carsten Otte
2007-01-30 16:41 ` Ralf Baechle
2007-01-30 17:35 ` Carsten Otte
2007-01-30 15:47 ` Carsten Otte
2007-01-30 22:04 ` Hugh Dickins
2007-01-31 13:51 ` Carsten Otte
2007-01-31 13:59 ` Carsten Otte
2007-01-31 16:31 ` Hugh Dickins
2007-02-01 16:21 ` Carsten Otte
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