On Fri, 2017-12-01 at 11:35 +0100, Lucas Stach wrote:
> Userptr, prime and shmem buffer objects have different lock ordering
> requirements. This is mostly due to the fact that we don't allow to mmap
> userptr buffers, so we won't ever end up in our fault handler for those,
> so some of the code pathes are never called with the mmap_sem held.
> 
> To avoid lockdep false positives, split them up into different lock classes.
> 
> Signed-off-by: Lucas Stach <l.st...@pengutronix.de>

Reviewed-by: Philipp Zabel <p.za...@pengutronix.de>

regards
Philipp
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