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    SubjectRe: [PATCH] Install kernel-page-flags.h
    On Mon, Mar 19, 2012 at 2:32 PM, Christoph Hellwig <> wrote:
    > On Wed, Mar 14, 2012 at 12:40:36PM +0200, Alexey Dobriyan wrote:
    >> >> Programs using /proc/kpageflags need to know about the various flags. ??The
    >> >> <linux/kernel-page-flags.h> provides them and the comments in the file
    >> >> indicate that it is supposed to be used by user-level code. ??But the file
    >> >> is not installed.
    >> >>
    >> >> The patch below installs the headers and marks the unstable flags as
    >> >> out-of-bounds.
    >> >
    >> > I don't think this is a good idea at all. ??Let's shoot the person who
    >> > added that braindead interface ASAP, and replace it with one printing
    >> > the flags in ASCII format.
    >> ASCII sucks.
    >> This interface is not for humans.
    > But we still can't lock down the page flags for a user interface - they
    > are a very scare resource and we can't afford to keep them stable due
    > to userspace poking into internals.
    > I guess the best we can do is to have a translation table for kernel
    > internal to external documented flags.  Once you export the header with
    > the meanings it's time to add that table, even if it starts out as a 1:1
    > mapping.

    Well, this is totally different issue.
    Translation is already there, see stable_page_flags().
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