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x86: Remove remap percpu allocator for the time being 

Remap percpu allocator has subtle bug when combined with page
attribute changing.  Remap percpu allocator aliases PMD pages for the
first chunk and as pageattr doesn't know about the alias it ends up
updating page attributes of the original mapping thus leaving the
alises in inconsistent state which might lead to subtle data
corruption.  Please read the following threads for more information:

  http://thread.gmane.org/gmane.linux.kernel/835783

The following is the proposed fix which teaches pageattr about percpu
aliases.

  http://thread.gmane.org/gmane.linux.kernel/837157

However, the above changes are deemed too pervasive for upstream
inclusion for 2.6.30 release, so this patch essentially disables
the remap allocator for the time being.

Signed-off-by: Tejun Heo <tj@kernel.org>
LKML-Reference: <4A1A0A27.4050301@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tejun Heo 2009-05-25 12:01:59 +09:00 committed by Ingo Molnar
parent 0af48f42df
commit 71c9d8b68b
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kernel/setup_percpu.c
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@ -160,8 +160,10 @@ static ssize_t __init setup_pcpu_remap(size_t static_size)
/* /*
* If large page isn't supported, there's no benefit in doing * If large page isn't supported, there's no benefit in doing
* this. Also, on non-NUMA, embedding is better. * this. Also, on non-NUMA, embedding is better.
*
* NOTE: disabled for now.
*/ */
if (!cpu_has_pse || !pcpu_need_numa()) if (true || !cpu_has_pse || !pcpu_need_numa())
return -EINVAL; return -EINVAL;
/* /*