Re: [PATCH] ppc64: Fix possible race with set_pte on a present PTE

[Linus Torvalds]

On Mon, 24 May 2004, Benjamin Herrenschmidt wrote:
> 
> There is a subtle race which can cause set_pte to be called on ppc64 on
> a PTE that is already present (that normally doesn't happen for us) and
> which itself, in the proper race condition, can trigger a duplicate hash
> entry to be added to the hash table (very bad).

So how exactly can the pte already be present? It's definitely illegal, 
since if that actually happened, that would imply a memory leak (whatever 
previous page was there just got silently dropped). 

		Linus
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