linux-kernel - Re: [PATCH 2/3] m68k/page_no.h: force _

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Message-Id: <20180703153019.GD4809@rapoport-lnx>
Date:   Tue, 3 Jul 2018 18:30:20 +0300
From:   Mike Rapoport <rppt@...ux.vnet.ibm.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Sam Creasey <sammy@...my.net>, linux-m68k@...ts.linux-m68k.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [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.