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SubjectRe: [PATCH 2/3] m68k/page_no.h: force __va argument to be unsigned long
On Tue, Jul 03, 2018 at 08:05:35AM -0700, 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?

Historically?

It started off with unsigned long, then commit e5f270954364 ("[LMB]: Make
lmb support large physical addressing") converted it to u64 for 32-bit
systems sake.

And the definition of ARCH_PHYS_ADDR_T_64BIT in commit 600715dcdf56
("generic: add phys_addr_t for holding physical addresses")) came in later.


--
Sincerely yours,
Mike.

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