Re: [PATCH] add delay between port write and port read

From: Linus Torvalds (torvalds@xxxxxxxxxxxxxxxxxxxx)
Date: Wed Feb 27 2019 - 12:29:19 EST


On Wed, Feb 27, 2019 at 9:05 AM Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote:
>
> Should "writeb_relaxed" on Alpha also use the barrier?

I think they should. Only the double-underscore (__raw_xyz()) ones
are entirely unordered, the relaxed ones are just unordered wrt
regular memory and DMA.

That said, I doubt anything much cares, and I'm not sure alpha has
ever done that.

Linus