From: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Date: Thu, 13 Apr 2017 10:20:23 +0200 (CEST) > spu_queue_register() needs to invoke setup functions on a particular > CPU. This is achieved by temporarily setting the affinity of the > calling user space thread to the requested CPU and reset it to the original > affinity afterwards. > > That's racy vs. CPU hotplug and concurrent affinity settings for that > thread resulting in code executing on the wrong CPU and overwriting the > new affinity setting. > > Replace it by using work_on_cpu_safe() which guarantees to run the code on > the requested CPU or to fail in case the CPU is offline. > > Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Acked-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
