Re: [PATCH] x86/calgary: fix bitcast type warnings

From: Logan Gunthorpe
Date: Fri Mar 29 2019 - 17:43:27 EST

On 2019-03-29 3:40 p.m., Jann Horn wrote:
> So what is the right thing to do in the context of
> arch/x86/kernel/pci-calgary_64.c? That code wants to perform MMIO with
> endianness conversion, and these accesses are always performed as
> MMIO. Using the non-atomic 64-bit I/O helpers for this would be kind
> of awkward, since the accesses would never actually be split...

Well, if you know you're only ever doing MMIO, you'd probably just want
to use readq() directly.