Messages in this thread | | | Date | Mon, 19 Mar 2012 14:45:36 +0200 | Subject | Re: [PATCH] Install kernel-page-flags.h | From | Alexey Dobriyan <> |
| |
On Mon, Mar 19, 2012 at 2:32 PM, Christoph Hellwig <hch@infradead.org> 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(). -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |