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SubjectRe: [PATCH] THP: Use explicit memory barrier
On Mon, 1 Apr 2013, Minchan Kim wrote:

> __do_huge_pmd_anonymous_page depends on page_add_new_anon_rmap's
> spinlock for making sure that clear_huge_page write become visible
> after set set_pmd_at() write.
>
> But lru_cache_add_lru uses pagevec so it could miss spinlock
> easily so above rule was broken so user may see inconsistent data.
>
> This patch fixes it with using explict barrier rather than depending
> on lru spinlock.
>

Is this the same issue that Andrea responded to in the "thp and memory
barrier assumptions" thread at http://marc.info/?t=134333512700004 ?


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