Messages in this thread | | | Date | Wed, 20 May 2020 20:35:29 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 3/8] srcu: Use local_lock() for per-CPU struct srcu_data access |
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On Wed, May 20, 2020 at 08:28:00PM +0200, Sebastian Andrzej Siewior wrote: > On 2020-05-20 13:42:59 [-0400], Joel Fernandes wrote: > > Hi Sebastian, > Hi Joel, > > > For pointer stability, can we just use get_local_ptr() and put_local_ptr() > > instead of adding an extra lock? This keeps the pointer stable while keeping > > the section preemptible on -rt. And we already have a lock in rcu_data, I > > prefer not to add another lock if possible. > > What is this get_local_ptr() doing? I can't find it anywhere…
I suspect it is ({ preempt_disable(); this_cpu_ptr(ptr); }), or something along those lines.
But yeah, I can't find it either.
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