Re: [RFC PATCH v2 1/2] printk-rb: add a new printk ringbuffer implementation

Peter Zijlstra
2019-06-28T16:07:55Z

On Fri, Jun 28, 2019 at 05:44:35PM +0200, Peter Zijlstra wrote:
> On Fri, Jun 28, 2019 at 11:50:33AM +0200, John Ogness wrote:

> > cmpxchg_release() vs WRITE_ONCE() is not safe?! Can you point me to
> > documentation about this?
>
> Documentation/atomic_t.txt has this, see the SEMANTICS section on
> atomic-set.

Also see: arch/parisc/lib/bitops.c for one such case.