Re: [Linaro-mm-sig] [PATCH 10/11] dma-buf: Use seqlock to close RCU race in test_signaled_single

2016-09-25 Thread Daniel Vetter
On Fri, Sep 23, 2016 at 03:02:32PM +0100, Chris Wilson wrote: > On Fri, Sep 23, 2016 at 03:49:26PM +0200, Daniel Vetter wrote: > > On Mon, Aug 29, 2016 at 08:08:33AM +0100, Chris Wilson wrote: > > > With the seqlock now extended to cover the lookup of the fence and its > > > testing, we can

Re: [Linaro-mm-sig] [PATCH 10/11] dma-buf: Use seqlock to close RCU race in test_signaled_single

2016-09-23 Thread Chris Wilson
On Fri, Sep 23, 2016 at 03:49:26PM +0200, Daniel Vetter wrote: > On Mon, Aug 29, 2016 at 08:08:33AM +0100, Chris Wilson wrote: > > With the seqlock now extended to cover the lookup of the fence and its > > testing, we can perform that testing solely under the seqlock guard and > > avoid the

Re: [Linaro-mm-sig] [PATCH 10/11] dma-buf: Use seqlock to close RCU race in test_signaled_single

2016-09-23 Thread Daniel Vetter
On Mon, Aug 29, 2016 at 08:08:33AM +0100, Chris Wilson wrote: > With the seqlock now extended to cover the lookup of the fence and its > testing, we can perform that testing solely under the seqlock guard and > avoid the effective locking and serialisation of acquiring a reference to > the