Re: [PATCH next v2 2/3] printk: change @clear_seq to atomic64_t

[Peter Zijlstra]

On Tue, Dec 08, 2020 at 11:36:44PM +0106, John Ogness wrote:
> For the state variable we chose atomic_long_t instead of atomic64_t for
> this reason. atomic_long_t operations are available atomically on all
> architectures.

Please put on your eye cancer gear and inspect the atomic implementation
of PA-RISC, Sparc32, feh, I forgot who else.

Those SMP capable architectures are gifted with just one XCHG like
atomic instruction :/ Anyway, as said in the other email, they also
don't have NMIs so it mostly works.