[Devel] [PATCH v2] tcache: Close race between tcache_invalidate_node() and tcache_attach_page()

[Andrey Ryabinin]

On 01/15/2018 09:08 PM, Kirill Tkhai wrote:
> tcache_attach_page()            tcache_invalidate_node()
> ..                              __tcache_lookup_node()
> ..                              __tcache_delete_node()
> Check node->invalidated         ..
> tcache_page_tree_insert()       ..
> tcache_lru_add()                ..
> ..                              tcache_invalidate_node_pages()
> ..                                node->invalidated = true
> 
> Check nr_page to determ if there is a race and repeat
> node pages iterations if so.
> 
> v2: Move invalidate assignment down in tcache_invalidate_node_tree().
> synchronize_sched() to be sure all tcache_attach_page() see invalidated.
> 
> Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>

Acked-by: Andrey Ryabinin <aryabinin at virtuozzo.com>