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Date: Tue, 13 Sep 2016 14:40:01 +0300 From: "Kirill A. Shutemov" <kirill@...temov.name> To: Rui Teng <rui.teng@...ux.vnet.ibm.com> Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>, Michal Hocko <mhocko@...e.com>, Naoya Horiguchi <n-horiguchi@...jp.nec.com>, Chen Gang <chengang@...ndsoft.com.cn>, "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>, Vlastimil Babka <vbabka@...e.cz>, "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>, hejianet@...ux.vnet.ibm.com Subject: Re: [RFC] mm: Change the data type of huge page size from unsigned long to u64 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
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