Re: About commit "io: change inX() to have their own IO barrier overrides"

[Sinan Kaya]

On 3/6/2020 2:54 AM, Arnd Bergmann wrote:
> The exact semantics of inl() and readl() are slightly different, so they
> have distinct sets of barriers in the asm-generic/io.h implementation.
> 
> For instance, the arm64 architectures defines in_par() as '__iormb(v)',
> but defines __io_ar() as a  '__rmb()'. Similarly, riscv defines them
> as "fence i,ior" and "fence i,r".

makes sense