Re: [PATCH v4 2/2] RISC-V: Implement sparsemem

[Paul Walmsley]

On Wed, 14 Aug 2019, Logan Gunthorpe wrote:

> On 2019-08-14 11:40 a.m., Paul Walmsley wrote:
> > On Wed, 14 Aug 2019, Logan Gunthorpe wrote:
> > 
> >> On 2019-08-14 7:35 a.m., Greentime Hu wrote:
> >>
> >>> Maybe this commit explains why it used HAVE_ARCH_PFN_VALID instead of SPARSEMEM.
> >>> https://github.com/torvalds/linux/commit/7b7bf499f79de3f6c85a340c8453a78789523f85
> >>>
> >>> BTW, I found another issue here.
> >>> #define FIXADDR_TOP            (VMALLOC_START)
> >>> #define FIXADDR_START           (FIXADDR_TOP - FIXADDR_SIZE)
> >>> #define VMEMMAP_END    (VMALLOC_START - 1)
> >>> #define VMEMMAP_START  (VMALLOC_START - VMEMMAP_SIZE)
> >>> These 2 regions are overlapped.
> >>>
> >>> How about this fix? Not sure if it is good for everyone.
> >>
> >> Yes, this looks good to me. I can fold these changes into my patch and
> >> send a v5 to the list.
> > 
> > The change to FIXADDR_TOP should be separated out into its own patch - it 
> > probably needs to go up as a fix.
> 
> I don't think so... VMEMMAP_START doesn't exist until the sparsemem
> patch so it can't be changed until after the sparsemem patch and no
> sense adding a bug in the sparsemem patch...

OK, that's fine then.


- Paul