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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 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().
On m68k-nommu this results in:

CC mm/nobootmem.o
In file included from
arch/m68k/include/asm/page.h:49,
from
arch/m68k/include/asm/thread_info.h:6,
from
include/linux/thread_info.h:38,
from
include/asm-generic/preempt.h:5,
from ./arch/m68k/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:81,
from include/linux/spinlock.h:51,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:6,
from include/linux/slab.h:15,
from mm/memblock.c:14:
mm/memblock.c: In function '__memblock_free_late':
arch/m68k/include/asm/page_no.h:21:23: warning:
cast to pointer from integer of different size [-Wint-to-pointer-cast]
#define __va(paddr) ((void *)(paddr))
^
arch/m68k/include/asm/page_no.h:26:57: note: in
definition of macro 'virt_to_page'
#define virt_to_page(addr) (mem_map + (((unsigned long)(addr)-PAGE_OFFSET)
>> PAGE_SHIFT))
^~~~
arch/m68k/include/asm/page_no.h:24:26: note: in
expansion of macro '__va'
#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
^~~~
arch/m68k/include/asm/page_no.h:29:39: note: in
expansion of macro 'pfn_to_virt'
#define pfn_to_page(pfn) virt_to_page(pfn_to_virt(pfn))
^~~~~~~~~~~
mm/memblock.c:1473:24: note: in expansion of macro
'pfn_to_page'
__free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
^~~~~~~~~~~


> > Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
> > ---
> > arch/m68k/include/asm/page_no.h | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/m68k/include/asm/page_no.h b/arch/m68k/include/asm/page_no.h
> > index e644c4d..6bbe520 100644
> > --- a/arch/m68k/include/asm/page_no.h
> > +++ b/arch/m68k/include/asm/page_no.h
> > @@ -18,7 +18,7 @@ extern unsigned long memory_end;
> > #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
> >
> > #define __pa(vaddr) ((unsigned long)(vaddr))
> > -#define __va(paddr) ((void *)(paddr))
> > +#define __va(paddr) ((void *)((unsigned long)(paddr)))
> >
> > #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
> > #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
> > --
> > 2.7.4
>
> --
> Michal Hocko
> SUSE Labs
>

--
Sincerely yours,
Mike.

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