Re: [PATCH 2/3] m68k/page_no.h: force __va argument to be unsigned long

[Mike Rapoport]

On Tue, Jul 03, 2018 at 05:14:01PM +0200, Michal Hocko wrote:
> On Tue 03-07-18 08:05:35, Matthew Wilcox wrote:
> > On Tue, Jul 03, 2018 at 06:03:16PM +0300, Mike Rapoport wrote:
> > > On Tue, Jul 03, 2018 at 04:20:54PM +0200, Michal Hocko wrote:
> > > > On Tue 03-07-18 13:29:54, Mike Rapoport wrote:
> > > > > Add explicit casting to unsigned long to the __va() parameter
> > > > 
> > > > Why is this needed?
> > > 
> > > To make it consitent with other architecures and asm-generic :)
> > > 
> > > But more importantly, __memblock_free_late() passes u64 to page_to_pfn().
> > 
> > Why does memblock work in terms of u64 instead of phys_addr_t?
> 
> Yes, phys_addr_t was exactly that came to my mind as well. Casting
> physical address to unsigned long just screams for potential problems.

Heh, that's what we have:

~/git/linux $ git grep 'define __va.*\(unsigned long\)' | wc -l
22
 
> -- 
> Michal Hocko
> SUSE Labs
> 

-- 
Sincerely yours,
Mike.