Re: [PATCH 00/23] Floppy driver cleanups

Willy Tarreau
2020-03-31T15:50:10Z

On Tue, Mar 31, 2020 at 08:28:12AM -0700, Christoph Hellwig wrote:
> On Tue, Mar 31, 2020 at 01:01:36PM +0200, Willy Tarreau wrote:
> > I'm not sure what this implies regarding this code, to be honest. It's
> > very tricky and implements sort of a state machine using function pointers
> > within its interrupt handler so you never know exactly what accesses what,
> > and quite a part of it remains obscure to me :-/ I can accept to help, I
> > can even run tests since I still have running hardware, but I'd at least
> > need some guidance. And probably Denis would know better than me there.
> > Also I doubt we'd get sufficient testing on less common archs. While I
> > do have sparc64/parisc/alpha available, I haven't booted a recent kernel
> > on any of them for a while (2.4 used to be the last ones), and I'm not
> > sure it's reasonable to go into such changes without proper testing.
>
> The basic change is that instead of using bio_data() or page_address
> all pages coming from the block layer need to be properly kmap()ed.
> I'll try to cook something up an will send it to Denis and you for
> review and testing. The code things about sparc64/parisc/alpha is
> that they all don't have highmem, so these changes should be effective
> no-ops for them.

OK, thanks for the explanation!
Willy