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

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Date:   Tue, 3 Jul 2018 17:14:01 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        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 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.

-- 
Michal Hocko
SUSE Labs