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SubjectRe: [PATCH] __free_pages_ok oops
Andrea Arcangeli wrote:
>
> > Or I'm missing something. Did something change?
>
> as said in the previous email that becomes a buffercache mapped in
> userspace, with refcount > 1 (unfreeable from the vm side), so the
> __free_page from irq will do nothing (it will only decrease the refcount
> of 1 unit, and then the page will be released by the vm). If the
> refcount was 1 instead, then it means the page wasn't in the lru in the
> first place and so the check won't trigger either.

Ah.

If the second try_to_release_page() against the truncated page
(in shrink_cache()) succeeds, the page is removed from the LRU.

OK, I agree the weird case won't trigger the bug. So I think we
agree that we need to run with Hugh's BUG check and do nothing else.


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