Re: [RFC] mm: Change the data type of huge page size from unsigned long to u64

[Kirill A. Shutemov]

On Tue, Sep 13, 2016 at 07:21:07PM +0800, Rui Teng wrote:
> On 9/13/16 5:32 PM, Kirill A. Shutemov wrote:
> >On Tue, Sep 13, 2016 at 05:26:05PM +0800, Rui Teng wrote:
> >>The huge page size could be 16G(0x400000000) on ppc64 architecture, and it will
> >>cause an overflow on unsigned long data type(0xFFFFFFFF).
> >
> >Huh? ppc64 is 64-bit system and sizeof(void *) is equal to
> >sizeof(unsigned long) on Linux (LP64 model).
> >
> >So where your 0xFFFFFFFF comes from?
> >
> The size of unsigned long data type is 4 bytes

No, it's not.

-- 
 Kirill A. Shutemov