On Thu, Jan 15, 2015 at 05:16:46PM -0800, Andrew Morton wrote:
> On Thu, 15 Jan 2015 16:40:33 +0900 Joonsoo Kim wrote:
>
> > compound_head() is implemented with assumption that there would be
> > race condition when checking tail flag. This assumption is only true
> > when we try to access arbitr
On Thu, 15 Jan 2015, Andrew Morton wrote:
> And perhaps some explanation here as to why virt_to_head_page() can
> safely use compound_head_fast(). There's an assumption here that
> nobody will be dismantling the compound page while virt_to_head_page()
> is in progress, yes? And this assumption a
On Thu, 15 Jan 2015 16:40:33 +0900 Joonsoo Kim wrote:
> compound_head() is implemented with assumption that there would be
> race condition when checking tail flag. This assumption is only true
> when we try to access arbitrary positioned struct page.
>
> The situation that virt_to_head_page() i
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