linux-kernel - Re: [patch] mm: fix a race condition under SMC + COW

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Message-Id: <20060927.185541.02300409.davem@davemloft.net>
Date:	Wed, 27 Sep 2006 18:55:41 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	suresh.b.siddha@...el.com
Cc:	akpm@...l.org, hugh@...itas.com, linux-kernel@...r.kernel.org,
	asit.k.mallick@...el.com
Subject: Re: [patch] mm: fix a race condition under SMC + COW

From: "Siddha, Suresh B" <suresh.b.siddha@...el.com>
Date: Wed, 27 Sep 2006 17:23:55 -0700

> I am flushing the pte entry in ptep_clear_flush() and it is Ok not
> to do another TLB flush after doing set_pte_at().
> 
> On Sparc64, this new set_pte_at() (after ptep_clear_flush) will not batch
> any TLB flush as the previous pte contents were zero.
> 
> We are Ok with this patch, isn't it?

Ok, it seems PowerPC also has the "don't do anything if previous PTE
was zero" logic.  So yes, it should be ok.

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