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Re: [PATCH] mm: fix hang on anon_vma->root->lock

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From: Christoph Lameter
Subject: Re: [PATCH] mm: fix hang on anon_vma->root->lock
Date: Friday, August 27, 2010 - 12:29 pm

On Fri, 27 Aug 2010, Hugh Dickins wrote:


Argh. Right. Looked like a global to me. Did not see the earlier local
def.

If you still use a pointer then what does insure that the root
pointer was not changed after the ACCESS_ONCE? The free semantics
of an anon_vma?

Since there is no lock taken before the mapped check none of the
earlier reads from the anon vma structure nor the page mapped check
necessarily reflect a single state of the anon_vma.




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Messages in current thread:
[PATCH] mm: fix hang on anon_vma->root->lock, Hugh Dickins, (Wed Aug 25, 11:12 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, David Miller, (Wed Aug 25, 11:41 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Hugh Dickins, (Thu Aug 26, 3:54 am)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Rik van Riel, (Thu Aug 26, 6:32 am)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, David Miller, (Thu Aug 26, 12:00 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Andrea Arcangeli, (Thu Aug 26, 4:50 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Andrea Arcangeli, (Thu Aug 26, 5:19 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Hugh Dickins, (Thu Aug 26, 6:43 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Andrea Arcangeli, (Fri Aug 27, 2:55 am)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Hugh Dickins, (Fri Aug 27, 9:43 am)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Christoph Lameter, (Fri Aug 27, 10:13 am)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Hugh Dickins, (Fri Aug 27, 10:55 am)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Christoph Lameter, (Fri Aug 27, 12:29 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Hugh Dickins, (Fri Aug 27, 1:14 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Christoph Lameter, (Fri Aug 27, 1:56 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Hugh Dickins, (Fri Aug 27, 2:28 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Hugh Dickins, (Fri Aug 27, 2:33 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Christoph Lameter, (Fri Aug 27, 4:06 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Hugh Dickins, (Fri Aug 27, 6:07 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Christoph Lameter, (Fri Aug 27, 7:47 pm)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Peter Zijlstra, (Sat Aug 28, 3:17 am)
Re: [PATCH] mm: fix hang on anon_vma->root->lock, Andrea Arcangeli, (Sat Aug 28, 8:54 am)