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SubjectRe: truncate_list_pages() BUG and confusion
Martin J. Bligh wrote:
> Where did truncate_list_pages unlock it? It doesn't do that
> until after it's called truncate_complete_page, which (indirectly)
> frees the page ... ?

Ahh, put_page_testzero
#define put_page_testzero(p) atomic_dec_and_test(&(p)->count)

It will only try to free if the page count is zero. The caller makes
sure that this doesn't happen.

if (!PageReserved(page) && put_page_testzero(page)) {
if (PageLRU(page))
lru_cache_del(page);
__free_pages_ok(page, 0);
}


--
Dave Hansen
haveblue@us.ibm.com

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