From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kirill A. Shutemov" Subject: Re: [PATCH v6 3/5] mm: introduce mmap3 for safely defining new mmap flags Date: Fri, 25 Aug 2017 19:16:07 +0300 Message-ID: <20170825161607.6v6beg4zjktllt2z@node.shutemov.name> References: <150353211413.5039.5228914877418362329.stgit@dwillia2-desk3.amr.corp.intel.com> <150353213097.5039.6729469069608762658.stgit@dwillia2-desk3.amr.corp.intel.com> <20170824165546.GA3121@infradead.org> <20170825130011.GA30072@infradead.org> <20170825155803.4km7wttzadfqw2vb@node.shutemov.name> <20170825160236.GA2561@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20170825160236.GA2561@infradead.org> Sender: linux-parisc-owner@vger.kernel.org To: Christoph Hellwig Cc: Dan Williams , Andrew Morton , Jan Kara , Arnd Bergmann , "linux-nvdimm@lists.01.org" , Linux API , "linux-kernel@vger.kernel.org" , linux-xfs@vger.kernel.org, Linux MM , Andy Lutomirski , linux-fsdevel , "Kirill A. Shutemov" , linux-parisc@vger.kernel.org List-Id: linux-api@vger.kernel.org On Fri, Aug 25, 2017 at 09:02:36AM -0700, Christoph Hellwig wrote: > On Fri, Aug 25, 2017 at 06:58:03PM +0300, Kirill A. Shutemov wrote: > > Not all archs are ready for this: > > > > arch/parisc/include/uapi/asm/mman.h:#define MAP_TYPE 0x03 /* Mask for type of mapping */ > > arch/parisc/include/uapi/asm/mman.h:#define MAP_FIXED 0x04 /* Interpret addr exactly */ > > I'd be happy to say that we should not care about parisc for > persistent memory. We'll just have to find a way to exclude > parisc without making life too ugly. I don't think creapling mmap() interface for one arch is the right way to go. I think the interface should be universal. I may imagine MAP_DIRECT can be useful not only for persistent memory. For tmpfs instead of mlock()? -- Kirill A. Shutemov