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Date: Sat, 12 Aug 2017 19:44:14 -0700 From: Dan Williams <dan.j.williams@...el.com> To: Christoph Hellwig <hch@...radead.org> Cc: Jan Kara <jack@...e.cz>, linux-nvdimm <linux-nvdimm@...ts.01.org>, Dave Chinner <david@...morbit.com>, linux-xfs@...r.kernel.org, Andy Lutomirski <luto@...nel.org>, Linux FS Devel <linux-fsdevel@...r.kernel.org>, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org> Subject: Re: [RFC PATCH 0/7] dax, ext4: Synchronous page faults On Fri, Aug 11, 2017 at 3:03 AM, Christoph Hellwig <hch@...radead.org> wrote: > On Mon, Aug 07, 2017 at 05:24:08PM -0700, Dan Williams wrote: >> Does sys_mmap() reject unknown flag values today? I'm either not >> looking in the right place or it's missing and we'll need some >> interface/mechanism to check if MAP_SYNC is honored. > > It doesn't seem to reject unknown flags. > > The lack of flags checking strikes back once more, sighṫ. How about MAP_SYNC == (MAP_SHARED|MAP_PRIVATE)? On older kernels that should get -EINVAL, and on new kernels it means SYNC+SHARED.
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