Re: [PATCH] add delay between port write and port read
From: Maciej W. Rozycki (macro@xxxxxxxxxxxxxx)
Date: Wed Feb 27 2019 - 13:54:12 EST
On Wed, 27 Feb 2019, Linus Torvalds 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.
For that reason though we don't have the trailing barrier in the
`readX_relaxed' accessors in the MIPS port.